Java/com/study/demo2/Rectangle_Main.java

package com.study.demo2;

public class Main {
    public static void main(String[] args) {
        Rectangle rect1 = new Rectangle(5.0, 3.0);
        System.out.println("面积:" + rect1.getArea());
        System.out.println("周长:" + rect1.getPerimeter());
        
        Rectangle rect2 = new Rectangle();
        System.out.println("默认面积:" + rect2.getArea());
        System.out.println("默认周长:" + rect2.getPerimeter());
        
        rect2.setWidth(2.5);
        rect2.setHeight(4.0);
        System.out.println("修改后面积:" + rect2.getArea());
        System.out.println("修改后周长:" + rect2.getPerimeter());
    }
}