JavaOne2013 Review

1. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 1
J a v a O n e 2 0 1 3
2 2 – 2 6 s e p t e m b e r , S a n
F r a n c is c o

2. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 2
A g e n d a
W e lk o m
• J a v a O n e
• J a v a S E 8
• J a v a E E 7
• H ig h lig h t s
– B lin g ID E
– E r r a i
– R x J a v a
– U n it T e s t in g
– E v o lu t io n a r y
A lg o r it h m s
B lo g
Jeroen
Ted

3. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 3
J a v a O n e
2 2 t /m 2 6 s e p t e m b e r
S a n F r a n c is c o

4. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 4
J a v a S E 8
J S R 3 3 7

5. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 5
J a v a S E 8 (J S R 3 3 7 )
• L a m b d a e x p r e s s io n s
• B u lk d a t a o p e r a t io n s f o r c o lle c t io n s
– F ilt e r , m a p , r e d u c e
– S t r e a m it e r a t o r
• P a r a lle l a r r a y s o r t in g
• E x t e n s io n m e t h o d s
• D a t e a n d T im e A P I

6. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 6
J a v a S E 8 (J S R 3 3 7 ) L a m b a
E x p r e s s io n s
public interface ActionListener extends EventListener {
public void actionPerformed(ActionEvent e);
}
JButton testButton = new JButton("Testknopje");
testButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
System.out.println("Klik met Anon class");
}
});
testButton.addActionListener(e -> System.out.println("Klik met Lambda"));

7. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 7
J a v a S E 8 (J S R 3 3 7 ) B u lk O p e r a t io n s
List<Integer> numbers =
Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
// Verdubbel het eerste even getal groter dan 3 uit de lijst.
numbers.stream() // vs .parallelStream()
.filter(number -> number > 3)
.filter(number -> number % 2 == 0)
.mapToInt(number -> number * 2)
.findFirst()
.getAsInt()
// antwoord: 8

8. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 8
J a v a S E 8 (J S R 3 3 7 ) P a r a lle l A r r a y
S o r t in g
Arrays.sort(numbers) vs. Arrays.parallelSort(numbers)
V e r t ic a a l: t ijd , H o r iz o n t a a l: a a n t a l e le m e n t e n (4 C P U ’s )

9. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 9
J a v a S E 8 (J S R 3 3 7 ) E x t e n s io n
M e t h o d s
public interface Iterable<T> {
Iterator<T> iterator();
default void forEach(Consumer<? super T> action) {
Objects.requireNonNull(action);
for (T t : this) {
action.accept(t);
}
}
}
numbers.forEach(System.out::println);

10. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 1 0
J a v a S E 8 (J S R 3 3 7 ) : D a t e a n d T im e
A P I
static import java.time.Month.JUNE;
static import java.time.Month.DECEMBER;
LocalDate date = LocalDate.of(2013, JUNE, 30);
Month month = DECEMBER;
int monIndex = month.getValue(); // 1..12
ZonedDateTime now = ZonedDateTime.now();
String nowString = now.toString();
// 2013-08-06T18:12:17.423-04:00[America/New_York]
DateTimeFormatter fmt =
DateTimeFormatter.ISO_ZONED_DATE_TIME;
String nowFormatted = now.format(fmt);
// 2013-08-06T18:12:17.423-04:00[America/New_York]

11. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 1 1
J a v a S E 8 L in k s
J D K 8 P r o je c t P a g e
• h t t p : //o p e n jd k . ja v a . n e t /p r o je c t s /jd k 8 /
E a r ly A c c e s s J D K 8 J a v a d o c
• h t t p : //d o w n lo a d . ja v a . n e t /jd k 8 /d o c s
D e v e lo p e r P r e v ie w D o w n lo a d
• h t t p s : //jd k 8 . ja v a . n e t /d o w n lo a d . h t m l

12. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 1 2
J a v a E E 7
J S R 3 4 2
w w w . o r a c le . c o m /t e c h n e t w o r
k /ja v a /ja v a e e

13. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 1 3
J a v a E E 7
• J S O N
• W e b S o c k e t 1 . 0
• J A X -R S 2 . 0
• J S F 2 . 2
• S e r v le t 3 . 1
• E x p r e s s io n L a n g u a g e 3 . 0
• B a t c h 1 . 0
• C o n c u r r e n c y 1 . 0
• J M S 2 . 0
• J P A 2 . 1
• E J B 3 . 2
• C D I 1 . 1
• B e a n V a lid a t io n 1 . 1
• J T A 1 . 2
• In t e r c e p t o r s 1 . 2

14. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 1 4
J a v a E E 7
W e b s o c k e t A P I

15. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 1 5
J a v a E E 7
J a v a A P I f o r J S O N P r o c e s s in g 1 . 0

16. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 1 6
J a v a E E 7
J a v a S e r v e r F a c e s 2 . 2

17. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 1 7
J a v a E E 7
B a t c h A p p lic a t io n s f o r t h e J a v a P la t f o r m 1 . 0

18. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 1 8
H ig h lig h t s

19. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 1 9
B lin g ID E
T h e G P U -P o w e r e d G a m e ID E

20. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 2 0
E r r a i F r a m e w o r k
• H T M L 5 /C S S t e m p la t e s
• M a k k e lijk d e le n v a n c o d e o p c lie n t e n s e r v e r
• G W T o n d e r d e m o t o r k a p
• G e m a k v a n a n n o t a t ie s m e t C D I
• T w o -w a y d a t a b in d in g
• L o c a l s t o r a g e v ia J P A + d a t a s y n c
• M o b ile f e a t u r e s v ia P h o n e G a p

21. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 2 1
E r r a i F r a m e w o r k
H T M L 5 /C S S t e m p la t e s
<!DOCTYPE html>
<link href="css/bootstrap.css" rel="stylesheet">
<form data-field="app-template">
<input data-field="name" type="text" placeholder="Full Name">
<input data-field="email" type="text"
placeholder="you@example.com">
<textarea data-field="complaint" rows="10"></textarea>
<button data-field="submit">Submit</button>
</form>

22. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 2 2
E r r a i F r a m e w o r k
H e t g e m a k v a n a n n o t a t ie s .
@Page
@Templated
public class ComplaintForm extends Composite {
@Inject @Model private UserComplaint model;
@Inject @Bound @DataField private TextBox name;
@Inject @Bound @DataField private TextBox email;
@Inject @Bound @DataField private TextArea complaint;
@Inject @DataField private Button submit;
@Inject private EntityManager entityManager;
@Inject private ClientSyncManager syncManager;
}

23. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 2 3
E r r a i F r a m e w o r k
L in k s
W e b s it e :
• h t t p : //w w w . e r r a ip r o je c t . o r g
S lid e s :
• h t t p s : //o r a c le u s . a c t iv e e v e n t s . c o m /2 0 1 3 /c o n n e c t /f ile
D o w n lo a d /s e s s io n /2 9 D B B 4 5 5 B F 0 2 C 1 3 8 0 4 1 F A 2 3
D 7 1 D 5 2 8 C 0 /C O N 4 3 1 3 _S a d ile k F u e r t h . p d f
V id e o :
• h t t p : //y o u t u . b e /r z 2 X 6 6 7 W k _4

24. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 2 4
F u n c t io n a l R e a c t iv e P r o g r a m m in g w it h
R x J a v a
R x J a v a
“A library for composing
asynchronous and event-
based programs using
observable sequences for
the Java VM”
h t t p s : //g it h u b . c o m /n e t
f lix /r x ja v a

25. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 2 5
T e n T h in g s Y o u S h o u ld K n o w W h e n
W r it in g G o o d U n it T e s t C a s e s in J a v a
1 . T h in k b e f o r e y o u a c t
2 . M a k e y o u r t e s t s u n d e r s t a n d a b le
3 . K e e p y o u r t e s t s “ s m a ll a n d s im p le ”
4 . T e s t o n e t h in g o n ly
5 . F a s t t e s t s o n ly
6 . A b s o lu t e r e p e a t a b ilit y
7 . In d e p e n d e n t t e s t s o n ly
8 . P r o v id e d ia g n o s t ic d a t a o n f a ilu r e
9 . N o h a r d -c o d in g o f y o u r e n v ir o n m e n t
1 0 . N o e x t r a n e o u s in p u t

26. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 2 6
E v o lu t io n a r y A lg o r it h m s
T h e K e y t o S o lv in g C o m p le x J a v a P u z z le s

27. s lid e© C o p y r ig h t 2 0 1 3 . F ir s t 8 2 7
F ir s t 8
f ir s t 8 . n l/b lo g
f a c e b o o k . c o m /F i
r s t 8 B V
@F ir s t 8 B V