Demonstration of this Pointer

class Rectangle 
           { 
                int l,b,a; 
                void setValue(int x,int y) 
                    { 
                        this.l=x; 
                        this.b=y; 
                    } 
                    int area() 
                       { 
                               a=this.l*this.b; 
                               return (this.a); 
                           } 
           }; 
                    class DemonstrationthisPointer 
                       { 
                           public static void main(String args[]) 
                              { 
                                  Rectangle rect = new Rectangle(); 
                                  rect.setValue(58,8); 
                                  System.out.println("Area of Rectangle is : "+rect.area()); 
                              } 
                       };