第二本书 一章（课后题）

Posted 2020-11-08

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2、教员要求账号使用面向对象写一个计算机类

import java.util.Scanner;

public class MyMain {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入2个数字：");
        int num1 = scanner.nextInt();
        int num2 = scanner.nextInt();
        Calculator cal = new Calculator();
        System.out.println("请输入符号(+-*/):");
        char world = scanner.next().charAt(0);
        switch (world) {
            case ‘+‘:
                int add = cal.add(num1, num2);
                System.out.println(add);
                break;
            case ‘-‘:
                int jian = cal.jian(num1, num2);
                System.out.println(jian);
                break;
            case ‘*‘:
                int cheng = cal.cheng(num1, num2);
                System.out.println(cheng);
                break;
            case ‘/‘:
                int chu = cal.chu(num1, num2);
                System.out.println(chu);
                break;
            default:
                System.out.println("输入有误！");
        }

    }
}

 

public class Calculator {
    //    计算两数相加之和
    public int add(int leftNum, int rightNum) {
        return leftNum + rightNum;
    }

    public int jian(int leftNum, int rightNum) {
        return leftNum - rightNum;
    }

    public int cheng(int leftNum, int rightNum) {
        return leftNum * rightNum;
    }

    public int chu(int leftNum, int rightNum) {
        return leftNum / rightNum;
    }
}

 3、假设当前时间是。。。编写一个CurrentTime类，定义show（）方法显示时间

public class CurrentTime {
    String time="2015年5月12日10点11分00秒";

    public void show(){
        System.out.println(time);
    }
}

 

public class MyMain {
    public static void main(String[] args) {
        CurrentTime currentTime = new CurrentTime();
        currentTime.show();
    }
}

 4、改进第三题

public class CurrentTime2 {


    String CurTime="2015,5,12";

    public void show(){
        System.out.println(CurTime);
    }
}

 

public class MyMain {
    public static void main(String[] args) {
        CurrentTime2 cur=new CurrentTime2();
        cur.show();
    }
}

 5、描述计算机，使用类的方式

public class Computer {
    String name[] = {"cpu", "主板", "显示器", "硬盘", "内存"};

    public void showInfo() {
        for (int i = 0; i < name.length; i++) {
            System.out.println(name[i]);
        }
    }
}

 

public class MyMain {
    public static void main(String[] args) {
        Computer computer = new Computer();
        computer.showInfo();
    }
}

 6、某公司开发新游戏，编写测试类，创建英雄对象等等。。。

public class Hero {
    String name="李晓霞",life="300";
    public void show(){
        System.out.println("我是英雄，我的基本信息如下：");
        System.out.println("姓名:"+name+","+"生命值:"+life);
    }
}

 

public class Monster {
    String name="小龟",type="潜水型";
    public void show(){
        System.out.println("我是怪物，我的基本信息如下：");
        System.out.println("姓名："+name+","+"类型："+type);
    }
}

 

public class Weapon {
    String name="死神镰刀",gong="12";
    public void show(){
        System.out.println("我是武器，我的基本信息如下：");
        System.out.println("武器名："+name+","+"攻击力："+gong);
    }
}

 

public class MyMain {
    public static void main(String[] args) {
        Hero hero = new Hero();
        Monster monster = new Monster();
        Weapon weapon = new Weapon();
        hero.show();
        monster.show();
        weapon.show();
    }
}