a . volume( ) ;
b . volume( ) ;
Suppose object a is of type box and object is of type Sphere then different
volume methods will call for a and b.
bank . withdraw( 5000 );
atm . withdraw( 5000 ) ;
Similarly withdraw method for bank and atm may have different rules.
c = a + b ;
z = x + y ;
Similarly if a b and c are numeric varaibles and x y and z are string variables.
The same + operator will perform addition or concatenation
abstract class Shape
{
abstract public void area();
}
class Circle extends Shape
{
private int R;
public Circle(int n)
{
R=n;
}
public void area()
{
double a=3.14*R*R;
System.out.println("Area is "+a);
}
}
class Rect extends Shape
{
private int L,B;
public Rect(int m,int n)
{
L=m;
B=n;
}
public void area()
{
int a=L*B;
System.out.println("Area is "+a);
}
}
class demo
{
public static void main(String args[])
{
Shape p,q;
p=new Circle(5);
p.area();
q=new Rect(10,20);
q.area();
}
}
Area is 78.5 Area is 200
abstract class Shape
{
abstract public void area();
}
class Circle extends Shape
{
private int R;
public Circle(int n)
{
R=n;
}
public void area()
{
double a=3.14*R*R;
System.out.println("Area is "+a);
}
}
class Rect extends Shape
{
private int L,B;
public Rect(int m,int n)
{
L=m;
B=n;
}
public void area()
{
int a=L*B;
System.out.pritln("Area is "+a);
}
}
class demo
{
public static void main(String args[])
{
Shape arr[]={
new Circle(5),
new Rect(2,4),
new Rect(10,5),
new Circle(7),
new Rect(5,5)
};
for(int i=0;i<arr.length;i++)
arr[i].area();
}
}
Area is 78.5 Area is 8 Area is 50 Area is 153.86 Area is 25
class Circle
{
private int R;
public Circle(int n)
{
R=n;
}
public void area()
{
double a=3.14*R*R;
System.out.println("Area is "+a);
}
}
class Rect
{
private int L,B;
public Rect(int m,int n)
{
L=m;
B=n;
}
public void area()
{
int a=L*B;
System.out.println("Area is "+a);
}
}
class demo
{
public static void main(String args[])
{
Circle a=new Circle(5);
if(a instanceof Circle)
System.out.println("Circle object");
if(a instanceof Rect)
System.out.println("Rect object");
if(a instanceof Object)
System.out.println("Object object");
}
}
Circle object Object object