mysquare.java

建议：此程序最好放到计算机上调试

public class MySquare extends MyRectangle{
public MySquare(){
   }
   public MySquare(int Length,int Width){
   l=Length;
   w=Width;
   }
   public static void main(String args[]){
       MySquare x=new MySquare(6,6);
    System.out.println(getArea());
   System.out.println(x.toString());
}}