Hi Friend,

Try the following code:

class rectangle{
    int length,breadth;
    void show(int l,int b){
        this.length=l;
        this.breadth=b; 
        }

        public int calculate(){
            int size;
            size=length*breadth;
            return size;
            }
            }

public class useOfthisoperator {
    public static void main(String args[]){ 
        rectangle r=new rectangle();
        r.show(5,6); 
        int area=r.calculate();
        System.out.println("this Area of rectangle is: "+area); 
        }
        }

Thanks