class Shape{
   Shape(int i){
     System.out.println("This is Shape" + i);
   }
}
public class Circle extends Shape{
   static Shape s1 = new Shape(1);
   Shape s2 = new Shape(3);
   Circle(int i){
     super(i);
     System.out.println("This is Circle" + i);
   }

   public static void main(String args[]){
     Circle c1 = new Circle(2);
   }
}

这是构造函数的问题，仔细从细节入手，知道对象的常见和销毁时间就引刃而解了