public abstract class Shape {
public abstract void zhouChang();
public abstract void mianJi();}
public class Test {
public static void main(String[] args) {
//new一个矩形长4宽5
Shape a=new Rectangle(4,5);
a.zhouChang();
a.mianJi();
//new一个圆，半径为5
Shape b=new Circle(5);
b.zhouChang();
b.mianJi();
}}
