public class RectangleDemo
{
  public static void main(String args[]){
    Rectangle rect, rect2;
    
    rect = new Rectangle();
    rect.x = 0;
    rect.y = 0;
    
    rect.w = 200;
    rect.h = 400;
    
    rect2 = new Rectangle();
    rect2.x = 0;
    rect2.y = 0;
    
    rect2.w = 50;
    rect2.h = 30;
    
    System.out.println(area(rect));
    System.out.println(area(rect2));

    
    Rectangle r;
    r = rect2; //aliasing!
    System.out.println(area(r));
    r = rect; //aliasing!
    System.out.println(area(r));
    
    r.h = 300;
    
    System.out.println(area(rect));
    
    System.out.println("Old Position: ("+rect.x+", "+rect.y+")");
    setPosition(rect, 10, 20);
    System.out.println("New Position: ("+rect.x+", "+rect.y+")");
    
    int count = 0;
    setCount(count, 10);
    System.out.println(count);

  }
  
  static int area(Rectangle rectangle){
    return rectangle.w * rectangle.h;
  }
  
  static void setPosition(Rectangle rect, int x, int y){
    rect.x = x;
    rect.y = y;
  }
  
  static void setCount(int count, int value){
    count = value;
  }
  
}