Exercise- 3
a) Implementing Class & Objects
AIM: To write a JAVA program to implement class mechanism. – Create a class, methods
and invoke them inside main method
SOURCE-CODE:
1.no return type and without parameter-list:
class A
{
int l=10,b=20;
void display()
{
System.out.println(l);
System.out.println(b);
}
}
class methoddemo
{
public static void main(String args[])
{
A a1=new A();
a1.display();
}
}
OUT-PUT:
10
20
2.no return type and with parameter-list:
class A
{
void display(int l,int b)
{
System.out.println(l);
System.out.println(b);
}
}
class methoddemo
{
public static void main(String args[])
{
A a1=new A();
a1.display(10,20);
}
}
OUT-PUT:
10
20
3. return type and without parameter-list
class A
{
int l=10,b=20;
int area()
{
return l*b;
}
}
class methoddemo
{
public static void main(String args[])
{
A a1=new A();
int r=a1.area();
System.out.println("The area is: "+r);
}
}
OUT-PUT:
The area is:200
4.return type and with parameter-list:
class A
{
int area(int l,int b)
{
return l*b;
}
}
class methoddemo
{
public static void main(String args[])
{
A a1=new A();
int r=a1.area(10,20);
System.out.println(“The area is:”+r);
}
}
OUT-PUT:
The area is:200
b) Implementing Constructor
AIM: To write a JAVA to implement constructor
SOURCE-CODEs:
(i)A constructor with no parameters:
class A
{
int l,b;
A()
{
l=10;
b=20;
}
int area()
{
return l*b;
}
}
class constructordemo
{
public static void main(String args[])
{
A a1=new A();
int r=a1.area();
System.out.println("The area is: "+r);
}
}
OUT-PUT:
The area is:200
(ii)A constructor with parameters:
class A
{
int l,b;
A(int u,int v)
{
l=u;
b=v;
}
int area()
{
return l*b;
}
}
class constructordemo
{
public static void main(String args[])
{
A a1=new A(10,20);
int r=a1.area();
System.out.println("The area is: "+r);
}
}
OUT-PUT:
The area is:200
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