面积周长练习

定义一个矩形类Rectangle：（知识点：对象的创建和使用）
1 定义三个方法：getArea()求面积、getPer()求周长，showAll()分别在控制台输出长、宽、面积、周长。
2 有2个属性：长length、宽width
3 创建一个Rectangle对象，并输出相关信息

 

package com.yhqtv.demo02.ThreadPool;


import java.util.Scanner;

public class Test1 {
    public static void main(String[] args) {

        Rectangle r = new Rectangle();

        System.out.println("请输入两个数字");
        Scanner s1 = new Scanner(System.in);
        Scanner s2 = new Scanner(System.in);
        int i = s1.nextInt();
        int i1 = s2.nextInt();
        if (i < 0 || i1 < 0) {
            System.out.println("超出正常范围");
            return;
        }
        r.setLength(i);
        r.setWidth(i1);
        r.showAll(r);
    }


}


class Rectangle {
    private int length;
    private int width;

    public Rectangle(int length, int width) {
        this.length = length;
        this.width = width;
    }

    public Rectangle() {

    }

    public int getLength() {
        return length;
    }

    public void setLength(int length) {
        this.length = length;
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public int getArea(Rectangle r) {
        int area = r.getWidth() * r.getLength();
        return area;
    }

    public int getPer(Rectangle r) {
        int per = 2 * (r.getLength() + r.getWidth());
        return per;
    }

    public void showAll(Rectangle r) {
        System.out.println(
                "矩形的长：" + r.getLength() + 
                "宽：" + r.getWidth() + 
                "面积：" + this.getArea(r) +
                "周长：" + this.getPer(r));
    }
}

 

"D:\Program Files\
请输入两个数字
-9
6
超出正常范围

Process finished with exit code 0