شرح مقرر البرمجة 2 "لغة جافا" - مادة النصفي كلية التكنولوجيا والعلوم التطبيقية جامعة القدس المفتوحة

1. 1

2. ModelDesignMembersObjects.
class
class MyClass} {
class MyClass} {.
ObjectsInstance of a class

3.  [modifier] class Nameofnewclass [extends
Nameofsuperclass implements interface] { }
public
friendly
final
abstract

4. ...

modifiers
class name
superclass
interface

5. ...

6. ...
public
friendly
friendly

7. ...
final
finalsubclasses
abstract
instance
abstract class MyClass

8. 
$




9. 
extend

class ChildClassName extends ParentClassName
}....{

10. java.lang.Object
extends

11. 
int , float , short , long , String , char
int MyField;


12. ...
public, protected, private
public
protected
private
friendly:

14. 
 MyClass Employee = new MyClass();
 MyClass Customer;
Customer = New MyClass();

15. 

Definition



16. 


void simpleMethod)( }........{

19. ACCESS MODIFIERS
public:
protected:

20. ...
friendly:
extended
private:

21. ACCESS SPECIFIES
static
staticstaticstatic
abstract

22. ...
final
overriding
synchronized

23. 3.1.2RETURNED VALUES
int, double, String, char.
Void

public class date}
int day; int month ; int year;
public String getDate () { String str= day +
"/"+month+"/"+year;
return str;
}}

24. 3.1.3PARAMETERS LIST



public void parMethod( int x, int y(

25. The output:

27. public

28. ...

class MyClass
{
private int MyField;
public MyClass(int value)
{
MyField = value;
}
public void setField(int value)
{
MyField = value;
}
public int getField()
{
return MyField;
}
} // end of class MyClass

29. ...
class MySubClass extends MyClass
{
private int MyNewField;
public MySubClass (int value)
{
super (value);
MyNewField = value ;
}
public void setNewField( int value)
{
MyNewField = value;
}
public int getNewField ()
{
return MyNewField;
}
}

30. ...
MySubClasssuper(value(
MyNewField.

31. MAIN
public static void main(String args][( } ...... {
publicmain
staticmainclass method.
voidmain

32. 



public

33. class MyClass
}
int x;
public MyClass (int value)
{
x = value ;
}
{
...
public class ConsDemo
{
public static void main(String args[]) {
MyClass t1 = new MyClass( 10 );
MyClass t2 = new MyClass( 20 );
System.out.println(t1.x + " " + t2.x);
}
}
The output:
10 20

34. 
public class AddTwo {
int sum(int i , int j) { return i+j;}
float sum (float a, float b) { return
a+b;}
}

35. 

36. LIFO.
recursion

java.utilstack

37. 


38. ...

class Elevator {
private boolean running = true;
public void ShutDown()
{ running = flase; }}
class SafeElevator extends Elevator {
public void ShutDown() {
if (isEmpty() )
running = false;
else
printErrormessage(); }
}

39. The output:
...

40. this
this


1this

41. 2SUPER


void speak () {
if( people_present)
super.speak();
else
System.out.println("hello");
}

42. array size

 int [ ] ai; // one dimensional array of type int
 short [ ][ ] as ; // two dimensional array of type short
 object [ ] ao; // array of type object

43. ...

// creates three objects stored in one dimensional array
 Exception ae[ ] = new Exception[3];
//create 6 objects stored in two dimensional array
 Exception aao[ ][ ] = new Exception[2][3];
 int [ ] Factorial = {1,1,2,6,24,120,720,5040}
 char ac[ ] = {'n','o','t',' ','a',' ','s','t','r','i','n','g'};

44. array_name[ ]=new array_type [array-size[
int int_table[ ] = new int[5[;
Integer int_obj_table[ ] = new Integer[5[;
Short graph[ ][ ]=new short [3[] [;
Graph[0][ ]= new short[4[;
Graph[1][ ]= new short[2[;
Graph[2][ ]= new short[7[;

45. 
Array-type array-name [ ] = {e1,e2,e3….};

char mchat[ ] = {‘t’,’e’,’x’,’t’};

char mychar[ ] = “text”;

46. 

Array-name[index[;
Arr1[3;]
Arr1
length

47. The output:

50. Systemarraycopy

51. 
short array_1 [] = {1,2,3,4,5};
short array_2 [] = new array[3];
System.arraycopy(array_1,1,array_2,0,3);
3

52. 
int x = new int[3[;
void SumUp(int b] [(;
,
SumUp(x(;

53. String40

valueOf)(String.
toString
indexOf
equalsIgnoreCase equals

54. SUBSTRINGS
SubStrings


55. Pointers
object


56. USING VECTORS
3
vector thevector = new vector)(;
1010
vector thevector = new vector(n(;
n
vector thevector = new vector(n , m(;
nm.

57. VECTORS METHODS
size()
length

X.size)(
x.
trimToSize()


58. ...
setSize(n(
nnnn.

59. add(object obj)

a.add(x(
xa.
add(int index, object obj)
index
a.add(5,x(
xa.
addElement
public final synchronized void addElement( object obj(


60. ...
insertElement

Vector vector1 = new Vector();
String current_name;
current_name="ali";
vector1.addElement(current_name);
vector1.addElement("Sami");
vector1.add("Ashraf");
current_name = "rami";
vector1.insertElementAt(current_name,0);
vector1.add(2,"hisham");
System.out.println(vector1);
System.out.println(vector1.size());
vector1.trimToSize();

61. remove( int index)
index
removeElement(object index)
namevector.removeElement(newName(;

62. ...
removeElementAt(int index)
removeAllElements)(

63. Get(int i(
i
Set(int i(
elementAt(int index(
setElementAt(int index(