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Question

你那个java问题还需要吗？我已经写好了

package com.study.test;

/**
 * @author zhma
 * @version 1.0.0
 * @ClassName Test.java
 * @Description TODO
 * @createTime 2022年06月16日 14:35:00
 */
public class Test {


    public static void main(String[] args) {
        System.out.println("———————————————————————第4题——————————————————————————");
        jishu();
        System.out.println("----------------第五题-------------------");
        Circle circle = new Circle();
        circle.setCenter(1, 2);
        circle.setRadius(5);
        circle.getCenter();
        circle.getRadius();
        circle.getArea();
        System.out.println("----------------第六题-------------------");
        Car car = new Car();
        car.start();
        car.stop();
        Ship ship = new Ship();
        ship.start();
        ship.stop();
        System.out.println("----------------第七题-------------------");
        int[][] a = new int[][] { { 7, 5, 6 }, { 2, 3, 5 } };
        int[][] b = new int[][] { { 9, 5, 2, 8 }, { 5, 9 ,7 ,2 }, { 4, 7, 5, 8 } };
        int[][] c = multiplyMatrix(a, b);
        System.out.println("矩阵a");
        printMatrix(a);
        System.out.println("*");
        System.out.println("矩阵b");
        printMatrix(b);
        System.out.println("=矩阵c");
        printMatrix(c);

        System.out.println("----------------第八题-------------------");
        Poeple poeple = new Poeple();
        try {
            poeple.setAge(180);
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }

    /*第四题*/
    public static void jishu() {
        for (int i = 0; i <= 74; i++) {
            System.out.println("当前计数：" + i);
            if (i == 74) {
                break;
            }
        }
    }
    /*-------------------------第五题-----------------------------*/

    static class Circle {

        private int centerX;

        private int centerY;

        private int radius;


        public String getCenter() {
            System.out.println("当前圆心坐标为：" + "(" + centerX + "," + centerY + ")");
            return "(" + centerX + "," + centerY + ")";
        }

        public void setCenter(int centerX, int centerY) {
            System.out.println("设置圆心坐标为：" + "(" + centerX + "," + centerY + ")");
            this.centerX = centerX;
            this.centerY = centerY;
        }


        public int getRadius() {
            System.out.println("获取圆半径：" + radius);
            return radius;
        }

        public void setRadius(int radius) {
            System.out.println("设置圆半径：" + radius);
            this.radius = radius;
        }

        public double getArea() {
            int r = this.radius;
            double area = Math.PI * r * r;
            System.out.println("当前圆面积:" + area);
            return area;
        }

    }


    /*-------------------------第六题-----------------------------*/
    interface Moveable {

        public void start();

        public void stop();

    }

    static class Car implements Moveable {

        @Override
        public void start() {
            System.out.println("汽车启动了");
        }

        @Override
        public void stop() {
            System.out.println("汽车停止了");
        }
    }

    static class Ship implements Moveable {

        @Override
        public void start() {
            System.out.println("轮船启动了");
        }

        @Override
        public void stop() {
            System.out.println("轮船停止了");
        }
    }

    /*-------------------------第七题-----------------------------*/

    public static int[][] multiplyMatrix(int[][] a, int[][] b) {
// 判断是否合法
        if (a == null || a == null || a.length == 0 || b.length == 0
                || a[0].length != b.length) {
            return null;
        }
// 计算相乘
        int[][] c = new int[a.length][b[0].length];
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < b[0].length; j++) {
                for (int k = 0; k < a[0].length; k++) {
                    c[i][j] += a[i][k] * b[k][j];
                }
            }
        }
        return c;
    }

    // 打印矩阵
    public static void printMatrix(int[][] c) {
        if (c != null) {
            for (int i = 0; i < c.length; i++) {
                for (int j = 0; j < c[0].length; j++) {
                    System.out.print(c[i][j] + " ");
                }
                System.out.println();
            }
        } else {
            System.out.println("无效");
        }
        System.out.println();
    }


    /*-------------------------第八题-----------------------------*/
    static class Poeple {

        private int age;

        public int getAge() {
            return age;
        }

        public void setAge(int age) throws Exception {
            System.out.println("设置年轻："+age);
            if (age < 1 || age > 130) {
                throw new Exception("年龄不能小于1,大于130");
            }
            this.age = age;
        }
    }

}