The document primarily discusses Java programming concepts, including class design, inheritance, access modifiers, method definitions, and array handling. It provides examples illustrating the creation and usage of classes, methods, arrays, and vectors, as well as concepts like recursion and exception handling. Additionally, it highlights the importance of modifiers such as public, private, and protected in the context of class and method accessibility.

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(