第二本书 一章（课后题）

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();    }}

原文地址：https://www.cnblogs.com/yunfeioliver/p/9083669.html