[School experiment] Write a rectangle class (Rect) and a circle class (Circle), find the area and perimeter of the rectangle and circle

topic:

Code:

1.Rectangle class Rect:

public class Rect {
    
    
    private double chang;
    private double kuan;

    public Rect() {
    
    
    }

    public Rect(double chang, double kuan) {
    
    
        this.chang = chang;
        this.kuan = kuan;
    }

    public double getChang() {
    
    
        return chang;
    }

    public void setChang(double chang) {
    
    
        this.chang = chang;
    }

    public double getKuan() {
    
    
        return kuan;
    }

    public void setKuan(double kuan) {
    
    
        this.kuan = kuan;
    }
}

2.Circle:

public class Circle {
    
    
    private int Radius;

    public Circle() {
    
    
    }

    public Circle(int radius) {
    
    
        Radius = radius;
    }

    public int getRadius() {
    
    
        return Radius;
    }

    public void setRadius(int radius) {
    
    
        Radius = radius;
    }


}

3. Function main method

import java.util.Scanner;

public class TheMain {
    
    
    public static void main(String[] args) {
    
    
        Scanner sc = new Scanner(System.in);
        double area_Rect,area_Circle;//面积
        double long_Rect,long_circle;//周长

        //圆形的周长与面积计算
        System.out.println("请输入圆的半径Radius");
        int Radius = sc.nextInt();//键盘录入圆的半径
        Circle ci = new Circle();
        ci.setRadius(Radius);
        area_Circle = ci.getRadius() * ci.getRadius() * 3.14;//圆形的面积计算
        System.out.println("area_Circle = " + area_Circle);
        long_circle = ci.getRadius() * 2* 3.14;//圆形的周长计算
        System.out.println("long_circle = " + long_circle);


        //矩形的周长与面积计算
        System.out.println("请输入矩形的长和宽");
        double chang = sc.nextDouble();//录入长和宽
        double kuan = sc.nextDouble();
        Rect re = new Rect();
        re.setChang(chang);
        re.setKuan(kuan);
        area_Rect = re.getChang() * re.getKuan();//矩形的面积计算
        System.out.println("area_Rect = " + area_Rect);
        long_Rect = (re.getChang() + re.getKuan()) * 2;
        System.out.println("long_Rect = " + long_Rect);//矩形的周长计算

    }
}

Operation result: