class Square
{
 int length;
 int width;
 int proportion;
 int perimeter;
 Square()
 {
  length=0;
  width=0;
 }
 Square(int x,int y)
 {
  length=x;
  width=y;
 }
 void proportion()
 {
  proportion=length*width;
  System.out.print("Proportion is ");
  System.out.println(proportion);
 }
 void perimeter()
 {
  perimeter=(length+width)*2;
  System.out.print("Perimeter is ");
  System.out.println(perimeter);
 }
 public static void main(String[] args)
 {
  Square S;
  S=new Square(5,6);
  S.proportion();
  S.perimeter();
 } 
}

/*初学jaVA，做了个这么个小东西，望大家多指教！  q[^_^]p

 */