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());
  }
}