Chika -java_tutorial_general_ver_3.7

TUTORIAL JAVA 3.7

MARISA W. PARYASTO - 33207002

Date: 13/10/2009.
1

TUTORIAL JAVA 3.7 2

Daftar Isi

Bagian 1. Dasar-dasar Java 4
1. Kelas dan Objek 4
1.1. Tujuan 4
1.2. Perangkat 4
1.3. Materi 4
1.3.1. Program 1 - Hello World 4
1.3.2. Program 2 - Kelas sederhana 4
1.3.3. Program 3 - Kelas sederhana dengan encapsulation 5
1.3.4. Program 4 - Inheritance sederhana 6
1.3.5. Program 5 - Inheritance 8
1.3.6. Program 6 - Inheritance dengan keyword Super 9
1.3.7. Program 7 - Inheritance dengan lebih banyak kelas 9
1.3.8. Program 8 - Inheritance overriding 11
2. Struktur dari Program Java 12
2.1. Tujuan 12
2.2. Perangkat 12
2.3. Materi 12
2.3.1. Program 1 12
2.3.2. Program 2 13
2.3.3. Program 3 14
2.3.4. Program 4 16
3. Layout Manager 19
3.1. Tujuan 19
3.2. Perangkat 19
3.3. Materi 19
3.3.1. Contoh Layout 19
3.3.2. Border Layout 22
3.3.3. Card Layout 23
3.3.4. Flow Layout 23
3.3.5. Grid Layout 24
3.3.6. Gridbag Layout 25
3.3.7. Box Layout 27
3.3.8. More examples 28

Bagian 2. Pemrograman dalam Java 32
4. Membuat applet dan application 32
4.1. Applet 32
4.1.2. Program 2 32
5. Event Handling 42
5.1. Program 1 42
5.2. Program 2 43
5.3. Program 3 43
5.4. Program 4 45
5.5. Program 5 45
6. Exception Handling 59

TUTORIAL JAVA 3.7 3

Bagian 3. Packages and Streams 65
7. Thread and Multithreading 65
8. Java I/O Stream Classes 85
8.1. Program 1 85
9. Server - Client Applications 97
Pustaka 143

TUTORIAL JAVA 3.7 4

Bagian 1. Dasar-dasar Java
1. Kelas dan Objek
1.1. Tujuan. Setelah menyelesaikan bagian ini, mahasiswa diharapkan dapat:
(1) Memahami cara mengkompilasi dan menjalankan program dengan meng-
gunakan Java
(2) Mengindentiﬁkasi pesan kesalahan yang terjadi pada saat proses kompilasi
dilakukan
(3) Memahami konsep dasar dan penggunaan kelas dalam bahasa pemrogram-
an Java
(4) Memahami konsep objek dan merepresentasikannya dalam bahasa pemro-
graman
(5) Memahami konsep encapsulation dan inheritance
1.2. Perangkat. PC dengan JDK 1.5
1.3. Materi.
1.3.1. Program 1 - Hello World. Ketiklah program dibawah ini lalu compile dengan
menggunakan perintah:
javac Hello . java
dan jalankan dengan perintah
java Hello
yang diketik dari console.
1 class Hello {
2 public s t a t i c void main ( S t r i n g [ ] a r g s )
3 {
4 System . out . p r i n t l n ( " H e l l o ␣World ! " ) ;
5 }
6 }
(1) Jelaskan untuk apakah perintah static, void dan args
(2) Apakah yang terjadi jika nama kelas tidak sama dengan nama ﬁle-nya?
Jelaskan mengapa demikian.
1.3.2. Program 2 - Kelas sederhana. Contoh program sederhana yang sudah meng-
gunakan kelas:
1 c l a s s Student {
2 private S t r i n g name ;
3 String status ;
4 int mark ;
5
6 public Student ( ) {
7 name = " " ;
8 s t a t u s = "" ;
9 mark = 0 ;
10 }

TUTORIAL JAVA 3.7 5

11
12 public void set_name ( S t r i n g n ) {
13 name = n ;
14 }
15
16 public void s e t _ s t a t u s ( S t r i n g s ) {
17 status = s ;
18 }
19
20 public void set_mark ( int m) {
21 mark = m;
22 }
23
24 public void d i s p l a y _ d a t a ( ) {
25 System . out . p r i n t l n ( "Name␣ : ␣ " + name ) ;
26 System . out . p r i n t l n ( " S t a t u s ␣ : ␣ " + s t a t u s ) ;
27 System . out . p r i n t l n ( "Mark␣ : ␣ " + mark ) ;
28 }
29 public s t a t i c void main ( S t r i n g a r g s [ ] ) {
30 Student me = new Student ( ) ;
31
32 me . set_name ( " Chika " ) ;
33 me . s e t _ s t a t u s ( " a c t i v e " ) ;
34 me . set_mark ( 9 0 ) ;
35 me . d i s p l a y _ d a t a ( ) ;
36 }
37 }
Baris 6-10 pada Program 2 disebut constructor. Apakah guna dari constructor
ini?

1.3.3. Program 3 - Kelas sederhana dengan encapsulation. Berikut adalah modifi-
kasi dari program sebelumnya, dilengkapi dengan contoh enkapsulasi. Pada baris
kedua, variabel dari kelas Student di set menjadi private sehingga variabel terse-
but tidak dapat diakses oleh kelas lain. Default dari variabel atau kelas jika tidak
didefinisikan access specifiernya adalah public.
1 c l a s s Student {
2 private S t r i n g name ;
3 String status ;
4 int mark ;
5
6 public Student ( ) {
7 name = " " ;
8
9 s t a t u s = "" ;
10 mark = 0 ;

TUTORIAL JAVA 3.7 6

11 }
12
13 public void set_name ( S t r i n g n ) {
14 name = n ;
15 }
16
17 public void set_data ( S t r i n g s ) {
18 status = s ;
19 }
20
21 public void set_mark ( int m) {
22 mark = m;
23 }
24
25 public void d i s p l a y _ s t a t u s ( ) {
26 System . out . p r i n t l n ( "Name␣ : ␣ " + name ) ;
27 System . out . p r i n t l n ( " S t a t u s ␣ : ␣ " + s t a t u s ) ;
28 System . out . p r i n t l n ( "Mark␣ : ␣ " + mark ) ; }
29 };
30
31 class TestStudent {
33 Student me = new Student ( ) ;
34
35 me . set_name ( " Chika " ) ;
36 me . s e t _ s t a t u s ( " a c t i v e " ) ;
37 me . set_mark ( 9 0 ) ;
38
39 me . name = "ABC" ;
40 me . s t a t u s = " z z z " ;
41
42 me . d i s p l a y _ d a t a ( ) ; }
43 }
Perhatikan baris 39 dan 40. Ketika kompilasi terdapat pesan error untuk baris
39 dan tidak untuk baris 40. Mengapa?

1.3.4. Program 4 - Inheritance sederhana. Berikut adalah contoh program inheri-
tance sederhana:
1 import j a v a . l a n g . S t r i n g ;
2
3 c l a s s Dad{
4 protected S t r i n g EyesColor ;
5 protected S t r i n g NoseShape ;
6 String Character ;
7

TUTORIAL JAVA 3.7 7

8 Dad ( ) {
9 EyesColor = "Dark␣Brown" ;
10 NoseShape = " Sharp " ;
11 C h a r a c t e r = " Nice " ;
12 }
13
14 void D i s p l a y ( ) {
15 System . out . p r i n t l n ( " Eyes ␣ c o l o r : ␣ " +
EyesColor ) ;
16 System . out . p r i n t l n ( " Nose ␣ shape : ␣ " +
NoseShape ) ;
17 // System . o u t . p r i n t l n (" C h a r a c t e r : " + C h a r a c t e r ) ;
18 }
19 };
20
21 c l a s s Me extends Dad{
22 S t r i n g EyesColor ;
23 S t r i n g NoseShape ;
24 String Character ;
25
26 void S e t C h a r a c t e r ( S t r i n g c ) {
27 Character = c ;
28 }
29
30 void S e t ( S t r i n g Eyes , S t r i n g Nose ) {
31 EyesColor = Eyes ;
32 NoseShape = Nose ;
33 }
34
35 void D i s p l a y ( ) {
36 super . D i s p l a y ( ) ;
37 System . out . p r i n t l n ( " C h a r a c t e r ␣ : ␣ " +
Character ) ;
38 }
39 }
40
41 c l a s s OtherPeople { }
42
43 public c l a s s DadAndMe{
45 Dad myDad = new Dad ( ) ;
46 Me I = new Me( ) ;
47 OtherPeople You = new OtherPeople ( ) ;
48
49 // myDad . D i s p l a y ( ) ;

TUTORIAL JAVA 3.7 8

50 I . S e t C h a r a c t e r ( "Shy" ) ;
51 myDad . C h a r a c t e r = "Grumpy" ;
52 I . Display () ;
53 }
54 }
Coba lengkapi class OtherPeople dan perhatikan bahwa atribut yang dimiliki
class Dad tidak terdapat pada class OtherPeople

1.3.5. Program 5 - Inheritance. Perhatikan program dibawah ini. Kelas Item me-
rupakan turunan dari kelas Book.
1 c l a s s Item {
2 S t r i n g item_name ;
3 int i t e m _ p r i c e ; // i n USD
4
5 void d i s p l a y D e t a i l s ( )
6 {
7 System . out . p r i n t l n ( " Item ␣Name␣ i s : "+item_name ) ;
8 System . out . p r i n t l n ( " Item ␣ P r i c e ␣ i s : "+i t e m _ p r i c e ) ;
9 }
10 }
11
12 public c l a s s Book extends Item {
13 S t r i n g author_name ;
14 float seriesno ;
15 public Book ( ) {
16 item_name="Macbeth" ;
17 i t e m _ p r i c e =10;
18 author_name=" S h a k e s p e a r e " ;
19 s e r i e s n o =1.0 f ;
20 }
21 void d i s p l a y D e t a i l s ( ) {
22 System . out . p r i n t l n ( " Author ␣Name␣ i s : "+author_name ) ;
23 System . out . p r i n t l n ( " S e r i e s ␣Number␣ i s : "+s e r i e s n o ) ;
24 }
25
27 Book bookobj=new Book ( ) ;
28 bookobj . d i s p l a y D e t a i l s ( ) ;
29 }
30 }

(1) Apakah hasil keluaran dari program tersebut?
(2) Tambahkan satu baris pada program di atas sehingga class Book dapat
menampilkan pula atribut item_name dan item_price dengan memanggil
method yang dimiliki oleh class Item.

TUTORIAL JAVA 3.7 9

1.3.6. Program 6 - Inheritance dengan keyword Super. Berikut adalah contoh peng-
gunaan keyword Super pada inheritance:
1 public c l a s s S u p e r c l a s s {
2 public void printMethod ( ) {
3 System . out . p r i n t l n ( " P r i n t e d ␣ i n ␣ S u p e r c l a s s . " ) ;
4 }
5 }
6
7 public c l a s s S u b c l a s s extends S u p e r c l a s s {
8 public void printMethod ( ) { // o v e r r i d e s p r i n t M e t h o d i n
Superclass
9 super . printMethod ( ) ;
10 System . out . p r i n t l n ( " P r i n t e d ␣ i n ␣ S u b c l a s s " ) ;
11 }
12
13 public s t a t i c void main ( S t r i n g [ ] a r g s ) {
14 S u b c l a s s s = new S u b c l a s s ( ) ;
15 s . printMethod ( ) ;
16 }
17 }

1.3.7. Program 7 - Inheritance dengan lebih banyak kelas. Hal apa yang berbeda
dari listing program dibawah ini dibandingkan dengan program-program sebelum-
nya?
1 c l a s s Toy {
2 int t o y I d ;
3 S t r i n g toyName ;
4 float toyPrice ;
5
6 public Toy ( int id , S t r i n g name , f l o a t p r i c e ) {
7 t o y I d=i d ;
8 toyName=name ;
9 t o y P r i c e=p r i c e ;
10 }
11
12 public void d i s p l a y D e t a i l s ( ) {
13 System . out . p r i n t l n ( "Toy␣ Id ␣ i s : "+t o y I d ) ;
14 System . out . p r i n t l n ( "Toy␣Name␣ i s : "+toyName ) ;
15 System . out . p r i n t l n ( "Toy␣ P r i c e ␣ i s : "+t o y P r i c e ) ;
16 }
17 }
18
19 c l a s s Customer {
20 int c u s t I d ;
21 S t r i n g custName ;

TUTORIAL JAVA 3.7 10

22 String custAddress ;
23
24 public Customer ( int id , S t r i n g name , S t r i n g a d d r e s s ) {
25 c u s t I d=i d ;
26 custName=name ;
27 c u s t A d d r e s s=a d d r e s s ;
28 }
29
31 System . out . p r i n t l n ( " Customer ␣ Id ␣ i s : "+c u s t I d ) ;
32 System . out . p r i n t l n ( " Customer ␣Name␣ i s : "+custName ) ;
33 System . out . p r i n t l n ( " Customer ␣ Address ␣ i s : "+c u s t A d d r e s s ) ;
34 }
35 }
36
37 c l a s s OnlineCustomer extends Customer {
38 String loginId ;
39 S t r i n g masterCardNo ;
40
41 public OnlineCustomer ( int cId , S t r i n g name , S t r i n g a d d r e s s ,
42 S t r i n g id , S t r i n g cardno ) {
43 super ( cId , name , a d d r e s s ) ;
44 l o g i n I d=i d ;
45 masterCardNo=cardno ;
46 }
47
49 super . d i s p l a y D e t a i l s ( ) ;
50 System . out . p r i n t l n ( " Customer ␣ l o g i n ␣ i d ␣ i s : "+l o g i n I d ) ;
51 System . out . p r i n t l n ( " Master ␣Card␣No␣ i s : "+masterCardNo ) ;
52 }
53 }
54
55 public c l a s s T r i a l {
57 OnlineCustomer cObj=new OnlineCustomer ( 1 0 0 1 , " C a r o l " , " 1 6 4 ,
58 ␣ ␣ ␣ ␣ ␣ ␣Redmond␣Way, Ohio " , " c a r o l @ u s a . n e t " , " 9473884833 " ) ;
59 Customer custObj = new Customer ( 0 0 1 , "Andrew" , " W a l l s t r e e t " ) ;
60 Toy tObj=new Toy ( 1 0 0 1 , " B a r b i e ␣ D o l l " , 4 0 ) ;
61 cObj . d i s p l a y D e t a i l s ( ) ;
62 tObj . d i s p l a y D e t a i l s ( ) ;
63 custObj . d i s p l a y D e t a i l s ( ) ;
64 }
65 }


1.3.8. Program 8 - Inheritance overriding. Pada contoh program ini ditunjukkan
bagaimana cara meng-override suatu kelas:
1 public c l a s s Animal {
2 public s t a t i c void t e s t C l a s s M e t h o d ( ) {
3 System . out . p r i n t l n ( "The␣ c l a s s ␣method␣ i n ␣ Animal . " ) ;
4 }
5
6 public void t e s t I n s t a n c e M e t h o d ( ) {
7 System . out . p r i n t l n ( "The␣ i n s t a n c e ␣method␣ i n ␣ Animal . " ) ;
8 }
9 }
10
11 public c l a s s Cat extends Animal {
12 public s t a t i c void t e s t C l a s s M e t h o d ( ) {
13 System . out . p r i n t l n ( "The␣ c l a s s ␣method␣ i n ␣Cat . " ) ;
14 }
15
16 public void t e s t I n s t a n c e M e t h o d ( ) {
17 System . out . p r i n t l n ( "The␣ i n s t a n c e ␣method␣ i n ␣Cat . " ) ;
18 }
19
20 public s t a t i c void main ( S t r i n g [ ] a r g s ) {
21 Cat myCat = new Cat ( ) ;
22 Animal myAnimal = myCat ;
23 Animal . t e s t C l a s s M e t h o d ( ) ;
24 myAnimal . t e s t I n s t a n c e M e t h o d ( ) ;
25 }
26 }


2. Struktur dari Program Java
(1) Memahami struktur program Java
(2) Memodiﬁkasi dan membuat program Java dengan struktur yang baik
(3) Mengidentiﬁkasi kesalahan pada program
(4) Membuat program dengan dokumentasi yang baik
(5) Membuat program applet dan aplikasi
2.3. Materi.
2.3.1. Program 1. Contoh program aplikasi sederhana
1 p u b l i c c l a s s SimpleApplicationCG {
2 p u b l i c s t a t i c v o i d main ( S t r i n g a r g s [ ] ) {
3 // D i s p l a y H e l l o World ! now
4 System . out . p r i n t l n ( " H e l l o , t h i s i s my f i r s t a p p l i c a t i o n
!") ;
5 }
6 }
Contoh program applet sederhana
1 import j a v a . awt . ∗ ;
2 import j a v a . a p p l e t . ∗ ;
3 p u b l i c c l a s s SimpleAppletCG e x t e n d s Applet {
4 p u b l i c v o i d i n i t ( ) { // I n i t i a l i z e t h e canvas
5 C o l o r l i g h t g r a y=new C o l o r ( 2 1 1 , 2 1 1 , 2 1 1 ) ; // c u s t o m i z e
6 setBackground ( l i g h t g r a y ) ; // make mellow background
7 r e s i z e (150 ,10) ;
8 }
9
10 p u b l i c v o i d p a i n t ( Gr ap h ic s g ) { // D i s p l a y H e l l o World !
11 g . d r a w S t r i n g ( " H e l l o , t h i s i s my f i r s t a p p l e t ! " , 5 0 , 2 5 ) ;
12 }
13 }
Program .html untuk menjalankan applet
1 <HTML>
2 <APPLET CODE=SimpleAppletCG . c l a s s WIDTH=100 HEIGHT=100>
3 </APPLET>
4 </HTML>
Contoh program applet untuk menampilkan tombol
1 import j a v a . a p p l e t . ∗ ;
3 p u b l i c c l a s s SimpleApplet e x t e n d s Applet {
4 S t r i n g s = " I ’m l e a r n i n g Java " ;
5 int x = 20;


6 int y = 50;
7
8 public void i n i t ( ) {
9 add ( new Button ( " H e l l o " ) ) ;
10 }
11 p u b l i c v o i d p a i n t ( Gr ap h ic s g ) {
12 g . drawString ( s , x , y ) ;
13 g . drawLine ( x , y+2, x+g e t F o n t M e t r i c s ( getFont ( ) ) .
s t r i n g W i d t h ( s ) , y+2) ;
14 }
15 }

Gambar 2.1. SimpleApplet.java

(1) Buatlah program aplikasi yang memberikan hasil yang sama dengan pro-
gram applet di atas
2.3.2. Program 2. Berikut adalah contoh program sederhana untuk membuat se-
buah jendela dengan dua buah tombol
1 import j a v a x . swing . ∗ ;
2
3 public c l a s s SampleProgram {
4 s t a t i c JFrame f 1 ;
5 JPanel p1 ;
6 JButton b1 , b2 ;
7
8 public SampleProgram ( ) {
9 p1=new JPanel ( ) ;
10 f 1 . getContentPane ( ) . add ( p1 ) ;
11 b1=new JButton ( " Submit " ) ;
12 p1 . add ( b1 ) ;
13 b2=new JButton ( " Cancel " ) ;
14 p1 . add ( b2 ) ;
15 }
16
17 public s t a t i c void main ( S t r i n g a r g s [ ] )


18 {
19 f 1=new JFrame ( " Sample ␣ A p p l i c a t i o n " ) ;
20 SampleProgram o b j=new SampleProgram ( ) ;
21 f1 . setSize (300 ,300) ;
22 f 1 . s e t V i s i b l e ( true ) ;
23 }
24 }

(1) Apa yang terjadi jika keyword “static” pada baris 4 dihilangkan. Beri pen-
jelasan.
(2) Berikan penjelasan mengenai apa yang dilakukan oleh baris ke-10

2.3.3. Program 3. Contoh berikut terdiri dari lebih banyak komponen. Perhatik-
an bagaimana penamaan variabel dan susunan program sehingga mudah untuk
ditelusuri.
3
4 public c l a s s D e a l e r {
5 s t a t i c JFrame f r a m e O b j e c t ;
6 JPanel p a n e l O b j e c t ;
7 JLabel l a b e l T i t l e ;
8 JLabel l a be l De al e rN a me ;
9 J T e x t F i e l d textDealerName ;
10 JLabel l a b e l D e a l e r A d d r e s s ;
11 JTextArea t e x t D e a l e r A d d r e s s ;
12 JLabel l a b e l D e a l e r P h o n e ;
13 JTextField textDealerPhone ;
14 JLabel l a b e l D e a l e r S e r v i c e s ;
15 JList listDealerServices ;
16 JButton b1 ;
17
18 public D e a l e r ( ) {
19 p a n e l O b j e c t = new JPanel ( ) ;
20 f r a m e O b j e c t . getContentPane ( ) . add ( p a n e l O b j e c t ) ;
21 // I n i t i a l i z e l a b e l c o n t r o l s
22 l a b e l T i t l e = new JLabel ( " D e a l e r ␣ Data␣ Entry ␣Form" ) ;
23 la b el D ea l er Na m e = new JLabel ( " D e a l e r ␣Name" ) ;
24 l a b e l D e a l e r A d d r e s s = new JLabel ( " Address " ) ;
25 l a b e l D e a l e r P h o n e = new JLabel ( "Phone␣Number" ) ;
26 l a b e l D e a l e r S e r v i c e s = new JLabel ( " S e r v i c e s ␣ O f f e r e d " ) ;
27 // I n i t i a l i z e d a t a e n t r y c o n t r o l s
28 textDealerName = new J T e x t F i e l d ( 1 5 ) ;
29 t e x t D e a l e r A d d r e s s = new JTextArea ( 4 , 1 2 ) ;
30 t e x t D e a l e r A d d r e s s . setLineWrap ( true ) ;
31 t e x t D e a l e r P h o n e = new J T e x t F i e l d ( 1 5 ) ;


32
33 S t r i n g s e r v i c e s [ ] = { " Free ␣ L o c a l ␣ C a l l s " ,
34 " Free ␣ S e r v i c e ␣ Charge " , " D i s c o u n t ␣ O f f e r " } ;
35 l i s t D e a l e r S e r v i c e s = new J L i s t ( s e r v i c e s ) ;
37
38 //Add t h e c o n t r o l s
39 p a n e l O b j e c t . add ( l a b e l T i t l e ) ;
40 p a n e l O b j e c t . add ( la b el D ea le r Na m e ) ;
41 p a n e l O b j e c t . add ( textDealerName ) ;
42 p a n e l O b j e c t . add ( l a b e l D e a l e r A d d r e s s ) ;
43 p a n e l O b j e c t . add ( t e x t D e a l e r A d d r e s s ) ;
44 p a n e l O b j e c t . add ( l a b e l D e a l e r P h o n e ) ;
45 p a n e l O b j e c t . add ( t e x t D e a l e r P h o n e ) ;
46 p a n e l O b j e c t . add ( l a b e l D e a l e r S e r v i c e s ) ;
47 p a n e l O b j e c t . add ( l i s t D e a l e r S e r v i c e s ) ;
48 p a n e l O b j e c t . add ( b1 ) ;
49 }
50
52 f r a m e O b j e c t=new JFrame ( " D e a l e r ␣Data␣ Entry " ) ;
53 D e a l e r d e a l e r O b j=new D e a l e r ( ) ;
54 frameObject . s e t S i z e (300 ,300) ;
55 f r a m e O b j e c t . s e t V i s i b l e ( true ) ;
56 }
57 }

Gambar 2.2. Dealer.java


(1) Jelaskan apa yang terjadi jika baris 68 dan 69 dimodiﬁkasi atau dihilangk-
an? Kesimpulan apa yang dapat diambil? [to be edited]
(2) Adakah perintah lain yang memberikan efek yang sama dengan baris 20?
Jika ya, sebutkan.

2.3.4. Program 4. Contoh program dengan penggunaan setToolTipText

3
4 public c l a s s VideoCD{
5 s t a t i c JFrame f r a m e O b j e c t ;
7 JLabel l a b e l T i t l e ;
8 JLabel labelAlbumName ;
9 JLabel l a b e l A r t i s t N a m e ;
10 JLabel l a b e l G e n r e ;
11 JLabel l a b e l P r i c e ;
12
13 // v a r i a b l e s f o r d a t a e n t r y c o n t r o l s
14 J T e x t F i e l d textAlbumName ;
15 JTextField textArtistName ;
16 JComboBox comboGenre ;
17 JTextField t e x t P r i c e ;
18 JButton b1 ;
19
20 public VideoCD ( ) {
22 f r a m e O b j e c t . getContentPane ( ) . add ( p a n e l O b j e c t ) ;
23
24 // I n i t i a l i z e l a b e l c o n t r o l s
25 l a b e l T i t l e=new JLabel ( " Video ␣CD␣Data␣ Entry ␣Form" ) ;
26 labelAlbumName = new JLabel ( "Name␣ o f ␣ t h e ␣Album" ) ;
27 l a b e l A r t i s t N a m e = new JLabel ( " A r t i s t /Group␣Name" ) ;
28 l a b e l G e n r e = new JLabel ( " Genre " ) ;
29 l a b e l P r i c e = new JLabel ( "CD␣ P r i c e " ) ;
30
31 // I n i t i a l i z e d a t a e n t r y c o n t r o l s
32 textAlbumName = new J T e x t F i e l d ( 1 5 ) ;
33 textAlbumName . s e t T o o l T i p T e x t (new S t r i n g ( " Enter ␣ t h e ␣
name␣ o f ␣ t h e ␣album␣ h e r e " ) ) ;
34 t e x t A r t i s t N a m e = new J T e x t F i e l d ( 1 5 ) ;
35 t e x t A r t i s t N a m e . s e t T o o l T i p T e x t (new S t r i n g ( " Enter ␣ t h e ␣
name␣ o f ␣ t h e ␣ a r t i s t / group ␣name␣ h e r e " ) ) ;
36 t e x t P r i c e = new J T e x t F i e l d ( 1 0 ) ;


37 t e x t P r i c e . s e t T o o l T i p T e x t (new S t r i n g ( " Enter ␣ t h e ␣ p r i c e ␣
o f ␣ t h e ␣CD␣ h e r e " ) ) ;
38 comboGenre=new JComboBox ( ) ;
39 comboGenre . s e t E d i t a b l e ( true ) ;
40 comboGenre . addItem (new S t r i n g ( " ␣Rock" ) ) ;
41 comboGenre . addItem (new S t r i n g ( " ␣ Ja zz " ) ) ;
42 comboGenre . addItem (new S t r i n g ( " ␣ Country " ) ) ;
43 comboGenre . addItem (new S t r i n g ( " ␣ B l u e s " ) ) ;
44 comboGenre . addItem (new S t r i n g ( " ␣ C l a s s i c " ) ) ;
45 comboGenre . addItem (new S t r i n g ( " ␣ A l t e r n a t i v e " ) ) ;
46 comboGenre . s e t T o o l T i p T e x t (new S t r i n g
47 ( " S p e c i f y ␣ t h e ␣ t a r g e t ␣ age ␣ group ␣and␣ t h e ␣ g e n d e r ␣ h e r e " ) ) ;
49
50 //Add t h e c o n t r o l s
51 p a n e l O b j e c t . add ( l a b e l T i t l e ) ;
52 p a n e l O b j e c t . add ( labelAlbumName ) ;
53 p a n e l O b j e c t . add ( textAlbumName ) ;
54 p a n e l O b j e c t . add ( l a b e l A r t i s t N a m e ) ;
55 p a n e l O b j e c t . add ( t e x t A r t i s t N a m e ) ;
56 p a n e l O b j e c t . add ( l a b e l P r i c e ) ;
57 p a n e l O b j e c t . add ( t e x t P r i c e ) ;
58 p a n e l O b j e c t . add ( l a b e l G e n r e ) ;
59 p a n e l O b j e c t . add ( comboGenre ) ;
61 }
62
64 f r a m e O b j e c t=new JFrame ( "VideoCD␣ D e t a i l s " ) ;
65 VideoCD cdObject=new VideoCD ( ) ;
66 frameObject . s e t S i z e (300 ,300) ;
67 f r a m e O b j e c t . s e t V i s i b l e ( true ) ;
68 }
69 }


Gambar 2.3. VideoCD

(1) Ubahlah program di atas menjadi program yang menggunakan applet


3. Layout Manager
(1) Menjelaskan perbedaan antara jenis-jenis layout manager yang dimiliki Ja-
va
(2) Menggunakan layout manager sesuai kebutuhan
3.3. Materi.
3.3.1. Contoh Layout. Perhatikan contoh program dibawah ini:
3 public c l a s s LayoutExample extends JApplet {
4 JPanel p1 , p3 ; JPanel p a n e l O b j e c t ;
5 JLabel labelCustName ;
6 JLabel l a b e l C u s t P a s s w o r d ;
7 J T e x t F i e l d textCustName ;
8 J P a s s w o r d F i e l d textCustPassword ;
9 JButton b ut t o nL o g in ;
10 GridBagLayout g l ;
11 G r i d B a g C o n s t r a i n t s gbc ;
12 JLabel l 1 , l 2 ;
13 JTextField t f 1 ;
14 JButton b1 , b2 , b3 , b4 , b5 , b6 , b7 , b8 , b9 , b10 , b11 , b12 , b13 , b14 ;
15 GridLayout g1 ;
16 BoxLayout b l 1 ;
17
19 g1=new GridLayout ( 8 , 2 ) ;
20 JPanel p1=new JPanel ( ) ;
21 p1 . s e t L a y o u t ( g1 ) ;
22 l 2=new JLabel ( " C a l c u l a t o r ␣ Panel " ) ;
23 t f 1=new J T e x t F i e l d ( 1 5 ) ;
24 b1=new JButton ( " 1 " ) ;
25 b2=new JButton ( " 2 " ) ;
26 b3=new JButton ( " 3 " ) ;
27 b4=new JButton ( " 4 " ) ;
28 b5=new JButton ( " 5 " ) ;
29 b6=new JButton ( " 6 " ) ;
30 b7=new JButton ( " 7 " ) ;
31 b8=new JButton ( " 8 " ) ;
32 b9=new JButton ( " 9 " ) ;
33 b10=new JButton ( "+" ) ;
34 b11=new JButton ( "−" ) ;
35 b12=new JButton ( " / " ) ;


36 b13=new JButton ( " ∗" ) ;
37 b14=new JButton ( "CALCULATE" ) ;
38 p1 . add ( l 2 ) ;
39 p1 . add ( t f 1 ) ;
40 p1 . add ( b1 ) ;
41 p1 . add ( b2 ) ;
42 p1 . add ( b3 ) ;
43 p1 . add ( b4 ) ;
44 p1 . add ( b5 ) ;
45 p1 . add ( b6 ) ;
46 p1 . add ( b7 ) ;
47 p1 . add ( b8 ) ;
48 p1 . add ( b9 ) ;
49 p1 . add ( b10 ) ;
50 p1 . add ( b11 ) ;
51 p1 . add ( b12 ) ;
52 p1 . add ( b13 ) ;
53 p1 . add ( b14 ) ;
54 p1 . setBackground ( C o l o r . b l u e ) ;
55 g l = new GridBagLayout ( ) ;
56 gbc = new G r i d B a g C o n s t r a i n t s ( ) ;
58 panelObject . setLayout ( g l ) ;
59
60 // I n i t i a l i z e c o n t r o l s
61 labelCustName = new JLabel ( " Customer ␣ Login ␣Name" ) ;
62 l a b e l C u s t P a s s w o r d = new JLabel ( " Password " ) ;
63 textCustName = new J T e x t F i e l d ( 1 5 ) ;
64 textCustPassword = new J P a s s w o r d F i e l d ( 1 5 ) ;
65 b ut t o nL o g in=new JButton ( " Login " ) ;
66
67 //Add c o n t r o l s t o t h e p a n e l
68 gbc . anchor = G r i d B a g C o n s t r a i n t s .NORTHWEST;
69 gbc . g r i d x = 1 ;
70 gbc . g r i d y = 5 ;
71 g l . s e t C o n s t r a i n t s ( labelCustName , gbc ) ;
72 p a n e l O b j e c t . add ( labelCustName ) ;
74 gbc . g r i d x = 4 ;
75 gbc . g r i d y = 5 ;
76 g l . s e t C o n s t r a i n t s ( textCustName , gbc ) ;
77 p a n e l O b j e c t . add ( textCustName ) ;
79 gbc . g r i d x = 1 ;
80 gbc . g r i d y = 9 ;


81 g l . s e t C o n s t r a i n t s ( l a b e l C u s t P a s s w o r d , gbc ) ;
82 p a n e l O b j e c t . add ( l a b e l C u s t P a s s w o r d ) ;
84 gbc . g r i d x = 4 ;
85 gbc . g r i d y = 9 ;
86 g l . s e t C o n s t r a i n t s ( textCustPassword , gbc ) ;
87 p a n e l O b j e c t . add ( textCustPassword ) ;
88 gbc . anchor=G r i d B a g C o n s t r a i n t s .NORTHWEST;
89 gbc . g r i d x =2;
90 gbc . g r i d y =13;
91 g l . s e t C o n s t r a i n t s ( buttonLogin , gbc ) ;
92 p a n e l O b j e c t . add ( b ut t o nL o g in ) ;
93 p a n e l O b j e c t . setBackground ( C o l o r . y e l l o w ) ;
95 b l 1=new BoxLayout ( p3 , BoxLayout . X_AXIS) ;
96 b l 1 . addLayoutComponent ( " C a l c u l a t o r ␣ Panel " , p1 ) ;
97 b l 1 . addLayoutComponent ( " Text ␣ Panel " , p a n e l O b j e c t ) ;
98 getContentPane ( ) . add ( p3 ) ;
99 p3 . add ( p1 ) ;
100 p3 . add ( p a n e l O b j e c t ) ;
101 }
102 }

Gambar 3.1. Layout Example

(1) Jelaskan perintah pada baris 54 dan 55


(2) Jelaskan mengapa program diatas menggunakan lebih dari satu panel

3.3.2. Border Layout. Berikut adalah contoh program dengan menggunakan border
layout
3
4 public c l a s s SampleBorderLayout extends JApplet {
5 JButton b1 , b2 , b3 , b4 , b5 ;
6 BorderLayout bd1 ;
7
9 bd1 = new BorderLayout ( ) ;
10 JPanel p1 = new JPanel ( ) ;
12 p1 . s e t L a y o u t ( bd1 ) ;
13 b1 = new JButton ( " Button ␣ 1 " ) ;
18 p1 . add ( " North " , b1 ) ;
19 p1 . add ( " South " , b2 ) ;
20 p1 . add ( "West" , b3 ) ;
21 p1 . add ( " East " , b4 ) ;
22 p1 . add ( " Center " , b5 ) ;
23 }
24 }

Gambar 3.2. Border Layout


3.3.3. Card Layout. Berikut adalah contoh program dengan menggunakan card la-
yout
3
4 public c l a s s SampleCardLayout extends JApplet {
5 JButton button1 , button2 , button3 ;
6 CardLayout c1 ;
7 JPanel p1 ;
8
10 c1 = new CardLayout ( ) ;
11 p1 = new JPanel ( ) ;
12 p1 . s e t L a y o u t ( c1 ) ;
13
15 button1 = new JButton ( " Button ␣ 1 " ) ;
18 p1 . add ( " Button1 " , button1 ) ;
21 }
22 }

Gambar 3.3. Card Layout

3.3.4. Flow Layout. Berikut adalah contoh program dengan menggunakan ﬂow la-
yout


3
4 public c l a s s SampleFlowLayout extends JApplet {
5 JButton b1 , b2 , b3 ;
6 FlowLayout f 1 ;
7
9 f 1 = new FlowLayout ( FlowLayout . LEFT) ;
12 p1 . s e t L a y o u t ( f 1 ) ;
16 p1 . add ( b1 ) ;
17 p1 . add ( b2 ) ;
18 p1 . add ( b3 ) ;
19 }
20 }

Gambar 3.4. Flow Layout

3.3.5. Grid Layout. Berikut adalah contoh program dengan menggunakan grid la-
yout
3 public c l a s s SampleGridLayout extends JApplet {
4 JButton b1 , b2 , b3 , b4 ;
5 GridLayout g1 ;
6
8 g1 = new GridLayout ( 2 , 2 , 5 0 , 5 0 ) ;
11 p1 . s e t L a y o u t ( g1 ) ;


16 p1 . add ( b1 ) ;
17 p1 . add ( b2 ) ;
18 p1 . add ( b3 ) ;
19 p1 . add ( b4 ) ;
20 }
21 }

Gambar 3.5. Grid Layout

3.3.6. Gridbag Layout. Berikut adalah contoh program yang menggunakan gridbag
layout
3 public c l a s s GridBagSample extends JApplet {
5 GridBagLayout gbObject ;
7 JButton b1 , b2 , b3 , b4 , b5 , b6 ;
8
10 gbObject = new GridBagLayout ( ) ;
13 getContentPane ( ) . add ( p a n e l O b j e c t ) ;
14 p a n e l O b j e c t . s e t L a y o u t ( gbObject ) ;
15 JButton b1 = new JButton ( " Button ␣ 1 " ) ;


21 gbc . f i l l = G r i d B a g C o n s t r a i n t s .BOTH;
22 gbc . anchor = G r i d B a g C o n s t r a i n t s .CENTER;
23 gbc . g r i d w i d t h = 1 ;
24 gbc . weightx = 1 . 0 ;
25 gbObject . s e t C o n s t r a i n t s ( b1 , gbc ) ;
27 gbc . g r i d w i d t h = G r i d B a g C o n s t r a i n t s .REMAINDER;
33 gbc . weightx = 0 . 0 ;
34 gbc . weighty = 1 . 0 ;
35 gbc . g r i d h e i g h t = 2 ;
36 gbc . g r i d w i d t h = 1 ;
40 gbc . g r i d h e i g h t = 1 ;
44 gbc . g r i d h e i g h t = 1 ;
47 }
48 }


Gambar 3.6. Gridbag Layout

3.3.7. Box Layout. Berikut adalah contoh program yang menggunakan box layout
3
4 public c l a s s SampleBoxLayout extends JApplet {
5 JPanel c a l p a n e l , l o g p a n e l ;
6 JPanel mainpanel ;
7
9 GridLayout g r i d O b j ;
10 GridBagLayout gridbagObj ;
12 BoxLayout boxObj ;
13
14 g r i d O b j = new GridLayout ( 8 , 2 ) ;
15 c a l p a n e l = new JPanel ( ) ;
16 c a l p a n e l . setLayout ( gridObj ) ;
17 gridbagObj = new GridBagLayout ( ) ;
19 l o g p a n e l = new JPanel ( ) ;
20 l o g p a n e l . s e t L a y o u t ( gridbagObj ) ;
21 mainpanel = new JPanel ( ) ;
22 boxObj = new BoxLayout ( mainpanel , BoxLayout . X_AXIS ) ;
23 boxObj . addLayoutComponent ( " C a l c u l a t o r ␣ Panel " , c a l p a n e l ) ;
24 boxObj . addLayoutComponent ( " TextPanel " , l o g p a n e l ) ;
25 getContentPane ( ) . add ( mainpanel ) ;
26 mainpanel . add ( c a l p a n e l ) ;


27 mainpanel . add ( l o g p a n e l ) ;
28 }
29 }

3.3.8. More examples. Berikut adalah contoh program tambahan

3
4 public c l a s s CustomerCareExecutive extends JApplet {
5 // V a r i a b l e s f o r t h e c o n t r o l s
7 JLabel l a b e l t i t l e , labelName , l a b e l G r a d e , l a b e l P e r f C r i t e r i a ,
labelRating ;
8 JLabel l i n e 1 , l i n e 2 , l i n e 3 ;
9 J T e x t F i e l d textName ;
10 JRadioButton buttonGrade1 , buttonGrade2 ;
11 JComboBox c o m b o P e r f C r i t e r i a ;
12 JList listRating ;
13 GridBagLayout g l ;
15
17 // i n i t i a l i z e t h e l a y o u t
18 g l = new GridBagLayout ( ) ;
20 p a n e l O b j e c t = ( JPanel ) getContentPane ( ) ;
21 panelObject . setLayout ( g l ) ;
22
23 // i n i t i a l i z e t h e c o n t r o l s
24 l a b e l t i t l e =new JLabel ( " Customer ␣ Care ␣ E x e c u t i v e ␣
Performance ␣ S h e e t " ) ;
25 l i n e 1=new JLabel ( "
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
") ;
26 labelName=new JLabel ( "Name␣ : " ) ;
27 l a b e l G r a d e=new JLabel ( " Grade ␣ : " ) ;
28 l a b e l P e r f C r i t e r i a=new JLabel ( " Performance ␣ C r i t e r i a " ) ;
29 l a b e l R a t i n g=new JLabel ( " Rating " ) ;
30 l i n e 2=new JLabel ( "−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−" ) ;
31 l i n e 3=new JLabel ( "−−−−−−−−−−−" ) ;
32 textName=new J T e x t F i e l d ( 1 0 ) ;
33 textName . s e t T e x t ( " C a r o l " ) ;
34 buttonGrade1=new JRadioButton ( "L1" ) ;
35 buttonGrade2=new JRadioButton ( "L2" ) ;


36 S t r i n g c r i t e r i a [ ] = { " Customer ␣ S a t i s f a c t i o n " , "
Productivity " };
37 c o m b o P e r f C r i t e r i a = new JComboBox ( c r i t e r i a ) ;
38 S t r i n g r a t i n g [ ] = { " Outstanding " , " E x c e l l e n t " , "Good" , "
Poor " } ;
39 l i s t R a t i n g=new J L i s t ( r a t i n g ) ;
40
41 // Apply c o n s t r a i n t s and add c o n t r o l s t o t h e p a n e l
43 gbc . g r i d x = 3 ;
44 gbc . g r i d y = 1 ;
45 g l . s e t C o n s t r a i n t s ( l a b e l t i t l e , gbc ) ;
46 p a n e l O b j e c t . add ( l a b e l t i t l e ) ;
48 gbc . g r i d x = 3 ;
49 gbc . g r i d y = 3 ;
50 g l . s e t C o n s t r a i n t s ( l i n e 1 , gbc ) ;
51 p a n e l O b j e c t . add ( l i n e 1 ) ;
53 gbc . g r i d x = 2 ;
54 gbc . g r i d y = 9 ;
55 g l . s e t C o n s t r a i n t s ( labelName , gbc ) ;
56 p a n e l O b j e c t . add ( labelName ) ;
58 gbc . g r i d x = 4 ;
59 gbc . g r i d y = 9 ;
60 g l . s e t C o n s t r a i n t s ( textName , gbc ) ;
61 p a n e l O b j e c t . add ( textName ) ;
63 gbc . g r i d x = 2 ;
64 gbc . g r i d y = 1 4 ;
65 g l . s e t C o n s t r a i n t s ( l a b e l G r a d e , gbc ) ;
66 p a n e l O b j e c t . add ( l a b e l G r a d e ) ;
68 gbc . g r i d x = 4 ;
69 gbc . g r i d y = 1 4 ;
70 g l . s e t C o n s t r a i n t s ( buttonGrade1 , gbc ) ;
71 p a n e l O b j e c t . add ( buttonGrade1 ) ;
73 gbc . g r i d x = 5 ;
74 gbc . g r i d y = 1 4 ;
75 g l . s e t C o n s t r a i n t s ( buttonGrade2 , gbc ) ;
76 p a n e l O b j e c t . add ( buttonGrade2 ) ;
78 gbc . g r i d x = 2 ;


79 gbc . g r i d y = 1 9 ;
80 g l . s e t C o n s t r a i n t s ( l a b e l P e r f C r i t e r i a , gbc ) ;
81 p a n e l O b j e c t . add ( l a b e l P e r f C r i t e r i a ) ;
83 gbc . g r i d x = 4 ;
84 gbc . g r i d y = 1 9 ;
85 g l . s e t C o n s t r a i n t s ( l a b e l R a t i n g , gbc ) ;
86 p a n e l O b j e c t . add ( l a b e l R a t i n g ) ;
88 gbc . g r i d x = 2 ;
89 gbc . g r i d y = 2 2 ;
93 gbc . g r i d x = 4 ;
94 gbc . g r i d y = 2 2 ;
98 gbc . g r i d x = 2 ;
99 gbc . g r i d y = 2 6 ;
100 g l . s e t C o n s t r a i n t s ( c o m b o P e r f C r i t e r i a , gbc ) ;
101 p a n e l O b j e c t . add ( c o m b o P e r f C r i t e r i a ) ;
103 gbc . g r i d x = 4 ;
104 gbc . g r i d y = 2 6 ;
105 g l . s e t C o n s t r a i n t s ( l i s t R a t i n g , gbc ) ;
106 p a n e l O b j e c t . add ( l i s t R a t i n g ) ;
107 }
108 }


Gambar 3.7. More examples


Bagian 2. Pemrograman dalam Java
4. Membuat applet dan application
4.1. Applet. Untuk memanggil applet perlu dibuat satu ﬁle dalam format html
yang berisi ﬁle .class yang akan dipanggil, seperti contoh di bawah ini:
1 <HTML>
2 <APPLET CODE=" D i s p l a y A p p l e t . c l a s s " WIDTH=" 200 " HEIGHT="
200 ">
3 </APPLET >
4 </HTML>

3
4 public c l a s s D i s p l a y A p p l e t extends JApplet {
5 public void p a i n t ( G ra ph ic s g ) {
6 g . d r a w S t r i n g ( " This ␣ i s ␣ d i s p l a y e d ␣by␣ t h e ␣ p a i n t ␣method"
,20 ,20) ;
7 }
8 }

4.1.2. Program 2. Berikut adalah program yang menunjukkan siklus dari suatu
applet. Perhatikan counter-counter dari applet tersebut.
3
4 public c l a s s AppletMethods extends JApplet {
5 int initCounter = 0;
6 int startCounter = 0;
7 int stopCounter = 0 ;
8 int destroyCounter = 0;
9
11 i n i t C o u n t e r ++;
12 repaint () ;
13 }
14
15 public void s t a r t ( ) {
16 s t a r t C o u n t e r ++;
17 repaint () ;
18 }
19
20 public void s t o p ( ) {
21 s t o p C o u n t e r++;


22 repaint () ;
23 }
24
25 public void d e s t r o y ( ) {
26 d e s t r o y C o u n t e r ++;
27 repaint () ;
28 }
29
31 g . d r a w S t r i n g ( " i n i t ␣ has ␣ been ␣ i n v o k e d ␣ "
32 + S t r i n g . valueOf ( initCounter ) + "␣ times " ,20 ,20) ;
33 g . d r a w S t r i n g ( " s t a r t ␣ has ␣ been ␣ i n v o k e d ␣ "
34 + S t r i n g . valueOf ( startCounter ) + "␣ times " ,20 ,35) ;
35 g . d r a w S t r i n g ( " s t o p ␣ has ␣ been ␣ i n v o k e d ␣ "
36 + S t r i n g . valueOf ( stopCounter ) + "␣ times " ,20 ,50) ;
37 g . d r a w S t r i n g ( " d e s t r o y ␣ has ␣ been ␣ i n v o k e d ␣ "
38 + S t r i n g . valueOf ( destroyCounter ) + "␣ times " ,20 ,65) ;
39 }
40 }

2
3 public c l a s s VCD extends JApplet {
4 // V a r i a b l e f o r t h e p a n e l
5 s t a t i c JPanel p a n e l O b j e c t ;
6 int stopCount ;
7 int s t a r t C o u n t ;
8
9 // V a r i a b l e s o f l a b e l s
10 JLabel labelVideoCDNo ;
11 JLabel labelVideoCDName ;
12 JLabel labelGenre ;
13 JLabel labelArtist ;
14
15 // L a b e l f o r t h e image
16 JLabel labelImagePosition ;
17
18 // L a b e l t o d i s p l a y c ou nt
19 JLabel labelCount ;
20
21 // V a r i a b l e s f o r d a t a e n t r y c o n t r o l s
22 JTextField textVideoCDNo ;
23 JTextField textVideoCDName ;
24 JComboBox comboGenre ;
25 JTextField textArtist ;


26
28 // C r e a t e p a n e l
31
32 // I n i t i a l i z i n g l a b e l s
33 labelVideoCDNo = new JLabel ( " Video ␣CD␣Number" ) ;
34 labelVideoCDName = new JLabel ( " ␣Name" ) ;
35 l a b e l G e n r e = new JLabel ( " Package " ) ;
36 l a b e l A r t i s t = new JLabel ( " A r t i s t " ) ;
37 l a b e l C o u n t=new JLabel ( ) ;
38 I c o n logoImage = new
39 ImageIcon ( " c : S e m e s t e r Batchcode
40 ␣ ␣ ␣ ␣ ␣ ␣ Groupname CellGO Images VideoCD . g i f " ) ;
41 l a b e l I m a g e P o s i t i o n = new JLabel ( logoImage ) ;
42
43 // I n i t i a l i z i n g T e x t F i e l d
44 textVideoCDNo = new J T e x t F i e l d ( 1 5 ) ;
45 textVideoCDName = new J T e x t F i e l d ( 3 0 ) ;
46 t e x t A r t i s t = new J T e x t F i e l d ( 3 0 ) ;
47 S t r i n g g e n r e s [ ] = { "Rock" , "Pop" , " C l a s s i c a l " , "Rap" } ;
48 comboGenre = new JComboBox ( g e n r e s ) ;
49
50 // Adding image t o t h e a p p l e t
51 p a n e l O b j e c t . add ( l a b e l I m a g e P o s i t i o n ) ;
52
53 // Adding c o n t r o l s f o r Video CD No
54 p a n e l O b j e c t . add ( labelVideoCDNo ) ;
55 p a n e l O b j e c t . add ( textVideoCDNo ) ;
56
57 // Adding c o n t r o l s f o r Video CD Name
58 p a n e l O b j e c t . add ( labelVideoCDName ) ;
59 p a n e l O b j e c t . add ( textVideoCDName ) ;
60
61 // Adding c o n t r o l s f o r g e n r e
62 p a n e l O b j e c t . add ( l a b e l G e n r e ) ;
63 p a n e l O b j e c t . add ( comboGenre ) ;
64
65 // Adding c o n t r o l s f o r Customer Age
66 p a n e l O b j e c t . add ( l a b e l A r t i s t ) ;
67 p a n e l O b j e c t . add ( t e x t A r t i s t ) ;
68
69 // Adding t h e l a b e l f o r c o un t
70 p a n e l O b j e c t . add ( l a b e l C o u n t ) ;


71 }
72
74 // Increment s t a r t C o u n t by 1
75 s t a r t C o u n t ++;
76
77 //Show t h e u p d a t e d co u nt
78 S t r i n g count=" S t a r t ␣ count ␣ i s ␣ "+s t a r t C o u n t
79 +" ␣ Stop ␣ count ␣ i s ␣ "+stopCount ;
80 l a b e l C o u n t . s e t T e x t ( count ) ;
81 }
82
84 // Increment stopCount by 1
85 stopCount++;
86 S t r i n g count=" Stop ␣ count ␣ i s ␣ "+stopCount
87 +" ␣ S t a r t ␣ count ␣ i s ␣ "+s t a r t C o u n t ;
88 l a b e l C o u n t . s e t T e x t ( count ) ;
89 }
90 }

3
4 public c l a s s D a i l y D i a r y extends JApplet {
5 JPanel panelObj ;
6 JLabel l a b e l T a s k ;
7 JButton b u t t o n S t o r e , b u t t o n D i s p l a y ;
8 JComboBox comboTaskList ;
9 JLabel l a b e l S t a t u s ;
10
12 panelObj=new JPanel ( ) ;
13 getContentPane ( ) . add ( panelObj ) ;
14
15 Font myfont = new Font ( " Times ␣New␣Roman" , Font .BOLD,
18) ;
16 l a b e l T a s k =new JLabel ( " Task ␣ L i s t : " ) ;
17
18 S t r i n g ta sk Me s sa ge [ ] = { " 9 . 0 0 ␣AM␣ Meeting ␣on␣ SEI ␣−␣CMM" ,
" 1 . 0 0 ␣PM␣ Submit ␣bug␣ r e p o r t ␣ f o r ␣ p r o j e c t ␣ t o ␣ t h e ␣
Manager" , "Book␣ c a k e s ␣ f o r ␣ t h e ␣ Bi rt hda y ␣ Party " , "
Book␣ t i c k e t s ␣ f o r ␣New␣York␣ f l i g h t " } ;
19


20 comboTaskList =new JComboBox ( t as k Me ss ag e ) ;
21 comboTaskList . s e t E d i t a b l e ( true ) ;
22 l a b e l S t a t u s=new JLabel ( ) ;
23 b u t t o n S t o r e =new JButton ( " S t o r e ␣ S c h e d u l e " ) ;
24 b u t t o n D i s p l a y =new JButton ( " D i s p l a y ␣ S t a t u s " ) ;
25
26 panelObj . add ( l a b e l T a s k ) ;
27 panelObj . add ( comboTaskList ) ;
28 panelObj . add ( b u t t o n S t o r e ) ;
29 panelObj . add ( b u t t o n D i s p l a y ) ;
30 panelObj . add ( l a b e l S t a t u s ) ;
31 }
32
34 g e t A p p l e t C o n t e x t ( ) . showStatus ( " Hi ! ! ! ␣You ’ l l ␣do␣ i t " ) ;
35 }
36
38 g e t A p p l e t C o n t e x t ( ) . showStatus ( " W i l l ␣ be ␣ back ␣ a g a i n ␣ t o ␣
remind ␣ you " ) ;
39 l a b e l S t a t u s . s e t T e x t ( "Unknown" ) ;
40 }
41
43 l a b e l S t a t u s . s e t T e x t ( S t r i n g . v a l u e O f ( comboTaskList .
getItemCount ( ) ) ) ;
44 }
45 }

2
3 public c l a s s D e a l e r extends JApplet {
4 // V a r i a b l e f o r t h e p a n e l
6
8 JLabel labelDealerCellNo ;
9 JLabel l ab e lD e al er N am e ;
10 JLabel labelDealerAddress ;
11 JLabel labelDealerScheme ;
12
14 JTextField textDealerCellNo ;
15 JTextField textDealerName ;


16 JComboBox comboDealerScheme ;
17 JTextField textDealerAddress ;
18
20 // Add a p p r o p r i a t e c o n t r o l s t o t h e frame
21 // C r e a t e p a n e l
24
25 // C r e a t e and add t h e a p p r o p r i a t e c o n t r o l s
26 // I n i t i a l i z i n g l a b e l s
27 l a b e l D e a l e r C e l l N o = new JLabel ( " C e l l ␣Number" ) ;
28 la b el D ea l er Na m e = new JLabel ( " ␣Name" ) ;
29 l a b e l D e a l e r S c h e m e = new JLabel ( "Scheme" ) ;
30 l a b e l D e a l e r A d d r e s s = new JLabel ( " Address " ) ;
31
32 // I n i t i a l i z i n g t e x t f i e l d
33 t e x t D e a l e r C e l l N o = new J T e x t F i e l d ( 1 5 ) ;
34 textDealerName = new J T e x t F i e l d ( 3 0 ) ;
35 t e x t D e a l e r A d d r e s s = new J T e x t F i e l d ( 3 0 ) ;
36 S t r i n g schemes [ ] = { " D i s c o u n t " , " Standard " } ;
37 comboDealerScheme = new JComboBox ( schemes ) ;
38
39 // Adding c o n t r o l s f o r c e l l Number
40 p a n e l O b j e c t . add ( l a b e l D e a l e r C e l l N o ) ;
41 p a n e l O b j e c t . add ( t e x t D e a l e r C e l l N o ) ;
42
43 // Adding c o n t r o l s f o r D e a l e r Name
44 p a n e l O b j e c t . add ( la b el D ea le r Na m e ) ;
45 p a n e l O b j e c t . add ( textDealerName ) ;
46
47 // Adding c o n t r o l s f o r D e a l e r Package
48 p a n e l O b j e c t . add ( l a b e l D e a l e r S c h e m e ) ;
49 p a n e l O b j e c t . add ( comboDealerScheme ) ;
50
51 // Adding c o n t r o l s f o r D e a l e r Address
52 p a n e l O b j e c t . add ( l a b e l D e a l e r A d d r e s s ) ;
53 p a n e l O b j e c t . add ( t e x t D e a l e r A d d r e s s ) ;
54 }
55
56 public void d e s t r o y ( ) {
57 showFrame ( ) ;
58 }
59
60 public void showFrame ( ) {


61 JFrame frame = new JFrame ( " D e a l e r ␣ D e t a i l s " ) ;
62
64 JLabel labelDealCellNo ;
65 JLabel labelDealName ;
66 JLabel labelDealAddress ;
67 JLabel labelDealScheme ;
68
70 JTextField t e x t D e a l C e l l N o=new J T e x t F i e l d ( 1 0 ) ;
71 JTextField textDealName=new J T e x t F i e l d ( 1 5 ) ;
72 JTextField textDealScheme=new J T e x t F i e l d ( 1 5 ) ;
73 JTextField t e x t D e a l A d d r e s s=new J T e x t F i e l d ( 2 5 ) ;
74 t e x t D e a l C e l l N o . s e t T e x t ( t e x t D e a l e r C e l l N o . getText ( ) ) ;
75 textDealName . s e t T e x t ( textDealerName . getText ( ) ) ;
76 t e x t D e a l A d d r e s s . s e t T e x t ( t e x t D e a l e r A d d r e s s . getText ( ) ) ;
77 textDealScheme . s e t T e x t ( S t r i n g . v a l u e O f
78 ( comboDealerScheme . g e t S e l e c t e d I t e m ( ) ) ) ;
79 l a b e l D e a l C e l l N o = new JLabel ( " C e l l ␣Number" ) ;
80 labelDealName = new JLabel ( " ␣Name" ) ;
81 l a b e l D e a l S c h e m e = new JLabel ( "Scheme" ) ;
82 l a b e l D e a l A d d r e s s = new JLabel ( " Address " ) ;
83 JPanel p a n e l=new JPanel ( ) ;
84
85 // add p a n e l t o t h e frame
86 frame . getContentPane ( ) . add ( p a n e l ) ;
87
88 // Adding c o n t r o l s f o r c e l l Number
89 p a n e l . add ( l a b e l D e a l C e l l N o ) ;
90 p a n e l . add ( t e x t D e a l C e l l N o ) ;
91
92 // Adding c o n t r o l s f o r D e a l e r Name
93 p a n e l . add ( labelDealName ) ;
94 p a n e l . add ( textDealName ) ;
95
96 // Adding c o n t r o l s f o r D e a l e r Package
97 p a n e l . add ( l a b e l D e a l S c h e m e ) ;
98 p a n e l . add ( textDealScheme ) ;
99
100 // Adding c o n t r o l s f o r D e a l e r Address
101 p a n e l . add ( l a b e l D e a l A d d r e s s ) ;
102 p a n e l . add ( t e x t D e a l A d d r e s s ) ;
103 frame . s e t S i z e ( 2 0 0 , 2 0 0 ) ;
104 frame . s e t V i s i b l e ( true ) ;
105 }


106 }

2
3 public c l a s s SampleProgram {
4 s t a t i c JFrame f 1 ;
5 JPanel p1 ;
6 JButton b1 ;
7
8 public SampleProgram ( ) {
9 p1 = new JPanel ( ) ;
10 f 1 . getContentPane ( ) . add ( p1 ) ;
11 b1 = new JButton ( " Submit " ) ;
12 p1 . add ( b1 ) ;
13 b1 . s e t T e x t ( " Cancel " ) ;
14 p1 . add ( b1 ) ;
15 }
16
18 f 1 = new JFrame ( " Sample ␣ A p p l i c a t i o n " ) ;
19 SampleProgram sp = new SampleProgram ( ) ;
20 f1 . setSize (300 ,300);
21 f 1 . s e t V i s i b l e ( true ) ;
22 }
23 }

2
3 public c l a s s NewJFrame extends JFrame {
4 JButton jButton1 , jButton2 , jButton3 ,
5 jButton4 , jButton5 , j B u tt o n6 ;
6
7 public NewJFrame ( ) {
8 j a v a . awt . G r i d B a g C o n s t r a i n t s g r i d B a g C o n s t r a i n t s ;
9 j B u tt o n1 = new JButton ( " 1 " ) ;
15
16 getContentPane ( ) . s e t L a y o u t (new j a v a . awt . GridBagLayout
() ) ;
17 s e t D e f a u l t C l o s e O p e r a t i o n (EXIT_ON_CLOSE) ;


18 g r i d B a g C o n s t r a i n t s = new j a v a . awt . G r i d B a g C o n s t r a i n t s ( )
;
19 gridBagConstraints . gridx = 1;
20 gridBagConstraints . gridy = 1;
21 g r i d B a g C o n s t r a i n t s . weightx = 0 . 5 ;
22 g r i d B a g C o n s t r a i n t s . weighty = 0 . 5 ;
23 getContentPane ( ) . add ( jButton1 , g r i d B a g C o n s t r a i n t s ) ;
;
27 gridBagConstraints . gridheight = 3;
28 g r i d B a g C o n s t r a i n t s . f i l l = j a v a . awt . G r i d B a g C o n s t r a i n t s .
VERTICAL ;
;
33 gridBagConstraints . gridheight = 3;
VERTICAL ;
;
39 gridBagConstraints . gridwidth = 3;
HORIZONTAL;
;
VERTICAL ;
;
51 // pack ( ) ;
52 setSize (800 ,600) ;


53 }
55 new NewJFrame ( ) . s e t V i s i b l e ( true ) ;
56 }
57 }


5. Event Handling
5.1. Program 1. Contoh program aplikasi untuk membuat satu tombol yang da-
pat di-klik dengan mengimplementasikan ActionListener.
2 import j a v a . awt . e v e n t . ∗ ;
4
5 c l a s s MyFrame extends JFrame{
6 JButton b1 ;
7
9 MyFrame f = new MyFrame ( ) ;
10 }
11
12 public MyFrame ( ) {
13 super ( "Window␣ T i t l e " ) ;
14 b1 = new JButton ( " C l i c k ␣Me ! " ) ;
15
16 getContentPane ( ) . add ( " Center " , b1 ) ;
17 B u t t o n L i s t e n e r b L i s t e n = new B u t t o n L i s t e n e r ( ) ;
18 b1 . a d d A c t i o n L i s t e n e r ( b L i s t e n ) ;
19 setSize (200 ,200) ;
20 s e t V i s i b l e ( true ) ;
21 }
22
23 c l a s s B u t t o n L i s t e n e r implements A c t i o n L i s t e n e r {
24 public void a c t i o n P e r f o r m e d ( ActionEvent e v t ) {
25 JButton s o u r c e = ( JButton ) e v t . g e t S o u r c e ( ) ;
26 s o u r c e . s e t T e x t ( " Button ␣ c l i c k e d ! " ) ;
27 }
28 }
29 }

Gambar 5.1. Button Clicked


5.2. Program 2. Contoh applet untuk membuat satu buah tombol yang meng-
implementasikan ActionListener. Perhatikan cara mendeklarasikan ActionListener
dan menghubungkannya pada tombol dibandingkan dengan Program 1
3
4 public c l a s s Welcome extends JApplet implements
ActionListener {
5 JPanel p1 ;
6 JButton buttonClickMe ;
7
11 buttonClickMe=new JButton ( " C l i c k ␣Me" ) ;
12 p1 . add ( buttonClickMe ) ;
13 buttonClickMe . a d d A c t i o n L i s t e n e r ( t h i s ) ;
14 }
15
16 public void a c t i o n P e r f o r m e d ( ActionEvent e v e n t O b j e c t ) {
17 g e t A p p l e t C o n t e x t ( ) . showStatus ( "You␣ c l i c k e d ␣ t h e ␣ C l i c k ␣
Me␣ button . " ) ;
18 }
19 }

Gambar 5.2. ButtonAppletBefore

5.3. Program 3. Contoh applet dengan satu button yang jika ditekan akan me-
nampilkan angka berurut yang dihasilkan oleh suatu counter. Perhatikan variabel
numClicks yang dideklarasikan static. Apakah guna dari variabel static?
4
5 public c l a s s MyButtonApplet extends JApplet implements A c t i o n L i s t e n e r {


Gambar 5.3. ButtonAppletAfter

6 JPanel p a n e l ;
7 JButton button ;
8 s t a t i c int numClicks = 0 ;
9
11 p a n e l = new JPanel ( ) ;
12 button = new JButton ( " C l i c k ! " ) ;
13
14 getContentPane ( ) . add ( p a n e l ) ;
15 p a n e l . add ( button ) ;
16 button . a d d A c t i o n L i s t e n e r ( t h i s ) ;
17 }
18
19 public void a c t i o n P e r f o r m e d ( ActionEvent e ) {
20 Object o b j = e . g e t S o u r c e ( ) ;
21 i f ( o b j == button ) {
22 numClicks++;
23 g e t A p p l e t C o n t e x t ( ) . showStatus ( "Number␣ o f ␣ c l i c k s ␣ : ␣ " + numClicks ) ;
24 }
25 }
26 }

Gambar 5.4. Counter Applet


5.4. Program 4. Contoh program aplikasi untuk membuat satu button yang bisa
di-klik dengan variabel static yang menjadi counter.
3
4 public c l a s s TestButton implements A c t i o n L i s t e n e r {
5 Frame f ;
6 Button b ;
7 s t a t i c int numClick = 0 ;
8
9 public TestButton ( ) {
10 f = new Frame ( " Test " ) ;
11 b = new Button ( " P r e s s ␣Me ! " ) ;
12 b . setActionCommand ( " B u tt o n P re s s e d " ) ;
13 }
14
15 public void LaunchFrame ( ) {
16 b . addActionListener ( this ) ;
17 f . add ( b , BorderLayout .CENTER) ;
18 f . pack ( ) ;
19 f . s e t V i s i b l e ( true ) ;
20 }
21
23 numClick++;
24 System . out . p r i n t l n ( " Action ␣ o c c u r e d " ) ;
25 System . out . p r i n t l n ( " Button ’ s ␣command␣ i s ␣ : ␣ " + e .
getActionCommand ( ) ) ;
26 System . out . p r i n t l n ( "Number␣ o f ␣ button ␣ c l i c k s ␣ : ␣ " +
numClick ) ;
27 }
28
30 TestButton tb = new TestButton ( ) ;
31 tb . LaunchFrame ( ) ;
32 }
33 }

5.5. Program 5. Contoh program aplikasi dengan dua buah tombol dengan dua
ActionListener
4
5 public c l a s s AngelandDevil {


6 JFrame frame ;
7
9 AngelandDevil aad = new AngelandDevil ( ) ;
10 aad . go ( ) ;
11 }
12
13 public void go ( ) {
14 frame = new JFrame ( ) ;
15 JButton button = new JButton ( " Should ␣ I ␣do␣ i t ? " ) ;
16 button . a d d A c t i o n L i s t e n e r (new A n g e l L i s t e n e r ( ) ) ;
17 button . a d d A c t i o n L i s t e n e r (new D e v i l L i s t e n e r ( ) ) ;
18 frame . getContentPane ( ) . add ( BorderLayout .CENTER, button
);
19 frame . pack ( ) ;
20 frame . s e t V i s i b l e ( true ) ;
21 }
22
23 c l a s s A n g e l L i s t e n e r implements A c t i o n L i s t e n e r {
25 System . out . p r i n t l n ( "Don ’ t ␣do␣ i t , ␣ you ␣ might ␣ r e g r e t ␣ i t ! "
);
26 }
27 }
28
29 c l a s s D e v i l L i s t e n e r implements A c t i o n L i s t e n e r {
31 System . out . p r i n t l n ( "Come␣on , ␣do␣ i t ! " ) ;
32 }
33 }
34 }

Gambar 5.5. Should I do it?

Gambar 5.6. Angel and Devil


4
5 public c l a s s NewFrame extends JFrame implements
ActionListener {
7 JButton button ;
8
9 NewFrame ( ) {
11 button = new JButton ( "New␣Frame" ) ;
12 button . a d d A c t i o n L i s t e n e r ( t h i s ) ;
14 p a n e l . add ( button ) ;
15 s e t D e f a u l t C l o s e O p e r a t i o n ( JFrame .EXIT_ON_CLOSE) ;
16 pack ( ) ;
18 }
19
21 Object temp = e . g e t S o u r c e ( ) ;
22 i f ( temp == button )
23 {
24 JButton b ;
25
26 JFrame smallFrame ;
27 smallFrame = new JFrame ( ) ;
28 b = new JButton ( " H e l l o ! " ) ;
29 smallFrame . getContentPane ( ) . add ( b ) ;
30 smallFrame . pack ( ) ;
31 // smallFrame . s e t S i z e ( 1 0 0 , 1 0 0 ) ;
32 smallFrame . s e t V i s i b l e ( true ) ;
33 }
34 }
35
37 NewFrame n f = new NewFrame ( ) ;
38 }
39 }


Gambar 5.7. NewFrame

Gambar 5.8. New Frame Pop

4
5 public c l a s s ClickMe extends JFrame implements
ActionListener {
6 s t a t i c int numClick = 0 ;
8 JButton b1 , b2 ;
9 JLabel l a b e l ;
10 S t r i n g TEXT = "Number␣ o f ␣ button ␣ c l i c k ␣ : ␣ " ;
11
12 ClickMe ( ) {
13 p a n e l = new JPanel (new GridLayout ( 0 , 3 ) ) ;
14 b1 = new JButton ( " C l i c k 1 " ) ;
15 b2 = new JButton ( " C l i c k 2 " ) ;
16 l a b e l = new JLabel (TEXT + " 0 ␣ ␣ " ) ;
17
18 b1 . a d d A c t i o n L i s t e n e r ( t h i s ) ;
20
22 p a n e l . add ( b1 ) ;
23 p a n e l . add ( b2 ) ;
24 p a n e l . add ( l a b e l ) ;
25 s e t D e f a u l t C l o s e O p e r a t i o n ( JFrame .EXIT_ON_CLOSE) ;
26 pack ( ) ;
28 }
29


31 Object temp = e . g e t S o u r c e ( ) ;
32
33 i f ( temp == b1 ) {
34 numClick = numClick + 1 ;
35 }
36 i f ( temp == b2 ) {
37 numClick = numClick + 2 ;
38 }
39
40 l a b e l . s e t T e x t (TEXT + numClick ) ;
41 }
42
44 ClickMe cm = new ClickMe ( ) ;
45 }
46 }

Gambar 5.9. Two Button

4
5 public c l a s s FavColor extends JApplet implements
ItemListener {
7 JLabel lName , l A d d r e s s , lSe x , l F a v C o l o r s ;
8 J T e x t F i e l d tfName , t f A d d r e s s ;
9 JRadioButton rbMale , rbFemale ;
10 JComboBox cb ;
11 JButton bSubmit , bReset ;
12 ButtonGroup bGroup ;
13
16 lName = new JLabel ( "Name" ) ;
17 l A d d r e s s = new JLabel ( " Address " ) ;
18 l S e x = new JLabel ( " Sex ␣ : ␣ " ) ;


19 l F a v C o l o r s = new JLabel ( " F a v o r i t e ␣ C o l o r s ␣ : ␣ " ) ;
20 tfName = new J T e x t F i e l d ( 1 0 ) ;
21 t f A d d r e s s = new J T e x t F i e l d ( 2 0 ) ;
22 rbMale = new JRadioButton ( " Male " ) ;
23 rbFemale = new JRadioButton ( " Female " ) ;
24 cb = new JComboBox ( ) ;
25 bSubmit = new JButton ( " Submit " ) ;
26 bReset = new JButton ( " Reset " ) ;
27 bGroup = new ButtonGroup ( ) ;
28
30 p a n e l . add ( lName ) ;
31 p a n e l . add ( tfName ) ;
32 p a n e l . add ( l A d d r e s s ) ;
33 p a n e l . add ( t f A d d r e s s ) ;
34 p a n e l . add ( l S e x ) ;
35 p a n e l . add ( rbMale ) ;
36 p a n e l . add ( rbFemale ) ;
37 p a n e l . add ( l F a v C o l o r s ) ;
38 p a n e l . add ( cb ) ;
39 p a n e l . add ( bSubmit ) ;
40 p a n e l . add ( bReset ) ;
41 bGroup . add ( rbMale ) ;
42 bGroup . add ( rbFemale ) ;
43 rbMale . a d d I t e m L i s t e n e r ( t h i s ) ;
44 rbFemale . a d d I t e m L i s t e n e r ( t h i s ) ;
45 }
46
47 public void itemStateChanged ( ItemEvent ev ) {
48 Object o b j=ev . g e t S o u r c e ( ) ;
49 i f ( o b j == rbMale ) {
50 cb . r e m o v e A l l I t e m s ( ) ;
51 cb . addItem ( " Black " ) ;
52 cb . addItem ( " Blue " ) ;
53 cb . addItem ( "Brown" ) ;
54 }
55 i f ( o b j == rbFemale ) {
56 cb . r e m o v e A l l I t e m s ( ) ;
57 cb . addItem ( " Pink " ) ;
58 cb . addItem ( "Red" ) ;
59 cb . addItem ( " Yellow " ) ;
60 }
61 }
62 }


Gambar 5.10. FavColor Male

Gambar 5.11. FavColor Female

4
5 public c l a s s A i r L i n e R e s e r v a t i o n extends JApplet
6 implements F o c u s L i s t e n e r {
7 S t r i n g d a t e [ ] = { " 12/21/2001 " , " 01/12/2002 " , " 12/25/2001 " } ;
8 S t r i n g d e s t [ ] = { " Chicago " , " Boston " , "New␣York" ,
9 " C a l i f o r n i a " , " A t l a n t a " , " Mexico " } ;
10 JPanel panelObj ;
11 JComboBox destCombo ;
12 JList dateList ;
13 JButton submit ;
14
16 d a t e L i s t=new J L i s t ( d a t e ) ;
17 dateList . addFocusListener ( this ) ;
18 destCombo=new JComboBox ( ) ;
19 submit=new JButton ( "SUBMIT" ) ;
20 panelObj=new JPanel ( ) ;


21
22 getContentPane ( ) . add ( panelObj ) ;
23 panelObj . add ( d a t e L i s t ) ;
24 panelObj . add ( destCombo ) ;
25 panelObj . add ( submit ) ;
26 }
27
28 public void f o c u s L o s t ( FocusEvent e ) {
29 Object temp=e . g e t S o u r c e ( ) ;
30
31 i f ( temp==d a t e L i s t ) {
32 destCombo . r e m o v e A l l I t e m s ( ) ;
33
34 int s e l e c t i o n=d a t e L i s t . g e t S e l e c t e d I n d e x ( ) ;
35 destCombo . addItem ( d e s t [ s e l e c t i o n ] ) ;
36 destCombo . addItem ( d e s t [ s e l e c t i o n +1]) ;
37 }
38 }
39
40 public void f o c u s G a i n e d ( FocusEvent e ) {
41 // W i l l not be h a n d l e d
42 }
43 }

Gambar 5.12. Airline Reservation

4
5 public c l a s s User extends JApplet implements
6 FocusListener , ItemListener , ActionListener {
7 // D e c l a r a t i o n f o r d a t a e n t r y c o n t r o l s
8 JPanel p1 ;
9 JLabel l 1 , l 3 , l 4 ;
10 JTextField t f 1 ;


11 JRadioButton male ;
12 JRadioButton f e m a l e ;
13 JComboBox c1 ;
14 JButton b1 ;
15 S t r i n g s u b j e c t a r r [ ] = { " S o f t w a r e " , " Movies " ,
16 " L i t e r a t u r e " , " S o c i e t y ␣and␣ P eo p le " } ;
17 S t r i n g name , sex , s u b j e c t ;
18
22 l 1=new JLabel ( " Enter ␣ Login ␣Name : " ) ;
23 l 3=new JLabel ( " S e l e c t ␣ s e x " ) ;
24 l 4=new JLabel ( " S u b j e c t ␣ o f ␣ I n t e r e s t : " ) ;
25 t f 1=new J T e x t F i e l d ( 1 0 ) ;
26 male=new JRadioButton ( " Male " ) ;
27 f e m a l e=new JRadioButton ( " Female " ) ;
28 c1=new JComboBox ( s u b j e c t a r r ) ;
30
31 p1 . add ( l 1 ) ;
32 p1 . add ( t f 1 ) ;
33 p1 . add ( l 3 ) ;
34 p1 . add ( male ) ;
35 p1 . add ( f e m a l e ) ;
36 p1 . add ( l 4 ) ;
37 p1 . add ( c1 ) ;
38 p1 . add ( b1 ) ;
39 male . a d d I t e m L i s t e n e r ( t h i s ) ;
40 female . addItemListener ( this ) ;
41 t f 1 . addFocusListener ( this ) ;
42 c1 . a d d A c t i o n L i s t e n e r ( t h i s ) ;
44 }
45
46 public void itemStateChanged ( ItemEvent ev ) {
47 Object o b j=ev . g e t S o u r c e ( ) ;
48 i f ( o b j==male )
49 s e x=" Male " ;
50 i f ( o b j==f e m a l e )
51 s e x=" Female " ;
52 i f ( o b j==c1 ) {
53 s u b j e c t=S t r i n g . v a l u e O f ( c1 . g e t S e l e c t e d I t e m ( ) ) ;
54 g e t A p p l e t C o n t e x t ( ) . showStatus ( s u b j e c t ) ;
55 }


56 }
57
58 public void f o c u s L o s t ( FocusEvent e ) {
60 i f ( temp==t f 1 ) {
61 S t r i n g strName=t f 1 . getText ( ) ;
62 i f ( strName . l e n g t h ( ) !=0)
63 name=strName ;
64 else
65 g e t A p p l e t C o n t e x t ( ) . showStatus ( "Name␣ i s ␣empty" ) ;
66 }
67 }
68
69 public void f o c u s G a i n e d ( FocusEvent e ) {
70 // W i l l not be h a n d l e d
71 }
72
74 Object o b j=e . g e t S o u r c e ( ) ;
75
76 i f ( o b j==b1 ) {
77 s u b j e c t=S t r i n g . v a l u e O f ( c1 . g e t S e l e c t e d I t e m ( ) ) ;
78 S t r i n g r e c o r d=name+" ␣ : ␣ "+s e x+" ␣ : ␣ "+s u b j e c t ;
79 g e t A p p l e t C o n t e x t ( ) . showStatus ( r e c o r d ) ;
80 }
81 }
82 }

Gambar 5.13



3
4 public c l a s s TwoListener implements MouseMotionListener ,
MouseListener {
5 Frame f ;
6 TextField t f ;
7
8 public TwoListener ( ) {
9 f = new Frame ( "Two␣ L i s t e n e r s ␣Example" ) ;
10 t f = new T e x t F i e l d ( 3 0 ) ;
11 }
12
13 public void launchFrame ( ) {
14 La be l l a b e l = new L ab el ( " C l i c k ␣and␣ drag ␣ t h e ␣mouse" ) ;
15 f . add ( label , BorderLayout .NORTH) ;
16 f . add ( t f , BorderLayout .SOUTH) ;
17 f . addMouseMotionListener ( t h i s ) ;
18 f . addMouseListener ( t h i s ) ;
19 f . setSize (300 ,200) ;
20 f . s e t V i s i b l e ( true ) ;
21 }
22
23 public void mouseDragged ( MouseEvent e ) {
24 S t r i n g s = "Mouse␣ d r a g g i n g ␣ : ␣X␣=␣ " + e . getX ( ) + " ␣Y␣=␣
" + e . getY ( ) ;
25 t f . setText ( s ) ;
26 }
27
28 public void mouseEntered ( MouseEvent e ) {
29 S t r i n g s = "The␣mouse␣ e n t e r e d " ;
31 }
32
33 public void mouseExited ( MouseEvent e ) {
34 S t r i n g s = "The␣mouse␣ has ␣ l e f t ␣ t h e ␣ b u i l d i n g " ;
36 }
37
38 public void mouseMoved ( MouseEvent e ) {}
39 public void mousePressed ( MouseEvent e ) {}
40 public void mouseClicked ( MouseEvent e ) {}
41 public void mouseReleased ( MouseEvent e ) {}
42
44 TwoListener two = new TwoListener ( ) ;
45 two . launchFrame ( ) ;


46 }
47 }

Gambar 5.14. TwoListener

4
5 public c l a s s Password extends JApplet implements
ActionListener {
7 JLabel lPassword ;
8 JPasswordField tfPassword ;
9 JButton bSubmit ;
10 // JButton b R e s e t ;
11
15 lPassword = new JLabel ( " Enter ␣ password ␣ : ␣ " ) ;
16 t f P a s s w o r d = new J P a s s w o r d F i e l d ( 1 0 ) ;
17 bSubmit = new JButton ( " Submit " ) ;
18 // b R e s e t = new JButton (" R e s e t ") ;
19
20 p a n e l . add ( lPassword ) ;
21 p a n e l . add ( t f P a s s w o r d ) ;
22 p a n e l . add ( bSubmit ) ;
23 // p a n e l . add ( b R e s e t ) ;
24
25 bSubmit . a d d A c t i o n L i s t e n e r ( t h i s ) ;
26 // bReset . addActionListener ( t h i s ) ;


27 }
28
31 boolean i s C o r r e c t = true ;
32
33 i f ( temp == bSubmit ) {
34 char [ ] c o r r e c t P a s s w o r d = { ’ c ’ , ’ h ’ , ’ i ’ , ’ k ’ , ’ a ’ } ;
35
36 i f ( t f P a s s w o r d . getPassword ( ) . l e n g t h
37 != c o r r e c t P a s s w o r d . l e n g t h ) {
38 isCorrect = false ;
39 }
40 else {
41 f o r ( int i = 0 ; i < t f P a s s w o r d . getPassword ( ) .
length ;
42 i ++){
43 i f ( t f P a s s w o r d . getPassword ( ) [ i ] !=
44 correctPassword [ i ] ) {

isCorrect = false ;
45 }
46 }
47 }
48
49 i f ( i s C o r r e c t == true ) {
50 g e t A p p l e t C o n t e x t ( ) . showStatus ( "The␣ password ␣ i s ␣
correct ") ;
51 }
52 else {
53 g e t A p p l e t C o n t e x t ( ) . showStatus ( "The␣ password ␣ i s ␣
incorrect ") ;
54 }
55 }
56 }
57 }


Gambar 5.15. Password


6. Exception Handling

1 public c l a s s HelloWorld
2 {
4 {
5 int i = 0 ;
6 S t r i n g [ ] g r e e t i n g s = { " H e l l o ␣World ! " , "No , ␣ I ␣mean␣ i t ! " , "HELLO␣WO
7 while ( i < 4 )
8 // w h i l e ( i < 3)
9 {
10 try
11 {
12 System . out . p r i n t l n ( g r e e t i n g s [ i ] ) ;
13 i ++;
14 }
15 catch ( ArrayIndexOutOfBoundsException e )
16 {
17 System . out . p r i n t l n ( "Re−s e t t i n g ␣ Index ␣ Value " ) ;
18 i = 0;
19 }
20 finally
21 {
22 System . out . p r i n t l n ( " This ␣ i s ␣ always ␣ p r i n t e d " ) ;
23 }
24 }
25 }
26 }

1 public c l a s s TryCatch
2 {
4 {
5 int a r r a y [ ] = { 0 , 0 } ;
6 int num1 , num2 , r e s u l t = 0 ;
7 num1 = 1 0 0 ;
8 num2 = 0 ;
9 try
10 {
11 r e s u l t = num1/num2 ;
12 System . out . p r i n t l n (num1/ a r r a y [ 2 ] ) ;
13 }
14 catch ( A r i t h m e t i c E x c e p t i o n e )
15 {
16 System . out . p r i n t l n ( " E r r o r ! ␣ D i v i s i o n ␣by␣ z e r o " ) ;

Chika -java_tutorial_general_ver_3.7

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