【年少的风】java继承测试--点与圆

 

import java.util.Scanner;

public class Pointer {

    private int x = 0;
    private int y = 0;

    Pointer() {

    }
    Pointer(int x,int y) {
        this.x = x;
        this.y = y;
    }

    public void show(int x, int y) {
        System.out.println("输入的点的坐标为（" + x + "," + y + "）");
    }

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        System.out.print("请输入x：");
        int x = sc.nextInt();
        System.out.print("请输入y：");
        int y = sc.nextInt();

        Pointer point = new Pointer(x,y);
        point.show(x,y);

        System.out.print("\n请输入圆半径：");
        int radius = sc.nextInt();

        Circle circle = new Circle(x,y,radius);
        circle.show(x,y,radius);
        circle.printArea(radius);
    }
}

class Circle extends Pointer {
    private int radius = 0;
    public Circle () {

    }

    public Circle (int x, int y, int radius) {
        this.radius = radius;
    }

    public void printArea (int radius) {
        System.out.println("\n圆的面积为：" + 3.14 * radius * radius);
    }

    public void show (int x, int y, int radius) {
        System.out.println("圆心坐标为：（" + x + "," + y + "）");
        System.out.println("圆半径为：" + radius);
    }
}