# Interface

1.Create an interface names ShapeInterface that has two methods and one constant and an abstract class named ShapeAbstract that has two instance variable, one abstract and one non-abstract method. Create a concrete class a.Rectangle that uses the interface b.Circle that uses the interface and abstract class

March 8, 2011 at 12:35 PM

```interface ShapeInterface{
int l=0,b=0;
public void area();
public void perimeter();
}
abstract class ShapeAbstract  {
double PI=3.14,r=0;
public void areaOfCircle() {
}
abstract public void circumference();
}
class Rectangle implements ShapeInterface{
int l=10,b=5;
public void area(){
int ar=l*b;
System.out.println("Area of Rectangle: "+ar);
}

public void perimeter(){
int k=l+b;
int p=2*k;
System.out.println("Perimeter of Rectangle: "+p);
}
}
class Circle extends ShapeAbstract implements ShapeInterface {
int r=5;
int l=15,b=10;
public void areaOfCircle() {
double area=PI*r*r;
System.out.println("Area of Circle: "+area);
}
public void circumference(){
double cir=2*PI*r;
System.out.println("Circumference of Circle: "+cir);
}

public void area(){
int ar=l*b;
System.out.println("Area of Rectangle: "+ar);
}
public void perimeter(){
int k=l+b;
int p=2*k;
System.out.println("Perimeter of Rectangle: "+p);
}
}
class InterfaceAndAbstractClass{
public static void main(String[]args){
Rectangle a=new Rectangle();
a.area();
a.perimeter();
System.out.println();
Circle b=new Circle();
b.areaOfCircle();
b.circumference();
b.area();
b.perimeter();
}
}
```

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