class Rectangle
{
  int x, y; //location
  int w, h; // width and height
  

  // Constructors
  Rectangle(){
    x = 0;
    y = 0;
    w = 0;
    h = 0;
  }
  
  Rectangle(int width, int height){
    x = 0;
    y = 0;
    w = width;
    h = height;
  }
  
  int area(){
    //Note implicit object context with w and h
    return w*h;
  }
  
  void setPosition(int xpos, int ypos){
    x = xpos;
    y = ypos;
  }
  
  public String toString(){
    return "pos = ("+x+", "+y+"), area = "+area();
  }
  
  void printDetails(){
    //Note the implicit object context when area() is called.
    System.out.print("pos = ("+x+", "+y+"), area = "+area());
    
    //Note the EXPLICIT object context with x, y and area().
    //System.out.print("pos = ("+this.x+", "+this.y+"), area = "+this.area());
  }

}