Java作业 第十二章

课后作业
1.根据输入1~12的数字，判断是春夏秋冬哪个季节，要求使用方法定义四个季节
代码如下:

import java.util.*;
public class Clas {         //季节类
    public  void spring (){  //春季
        System.out.println("该季节为春季");
    }
    public void summer(){   //夏季
        System.out.println("该季节为夏季");
    }
    public void autumn(){  //秋季
        System.out.println("该季节为秋季");
    }
    public void winter(){  //冬季
        System.out.println("该季节为冬季");
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Clas ae = new Clas();   //调用季节类
        System.out.print("请输入月份:");
        Scanner input = new Scanner (System.in);
        int mom = input.nextInt();
         switch (mom){

         case 3: case 4: case 5:        //switch的穿透性
             System.out.println();
            ae.spring();
             break;
         case 6: case 7: case 8:
             System.out.println();
             ae.summer();
             break;
         case 9: case 10: case 11:
             System.out.println();
             ae.autumn();
             break;
         case 12: case 1: case 2:
             System.out.println();
             ae.winter();
             break;
             default:
                 System.out.println("请输入正确的月份！");
                 break;
         }
    }

}

2.叙述如何编写类的JavaDoc注释

/**
*这是一个示例
*@author lyar
*/
public class LYAR(){

}

第一行用于描述注释的对象的主要功能，第二行@author是JavaDoc标签

3.用代码实现第十一章作业中简答题第2题的计算器类(Calculator),编写Calculator类，定义成员变量为运算数1(num1)和运算数2(num2)，实施成员方法加(add),减(minus),乘(multiple),除(divide)
代码如下:

import java.util.Scanner;



/**

 * 计算器类

 * @author 段海锋

 *

 */

public class Calculator {

    int num1;//输入数字1

    int num2;//输入数字2

    double result;//结果

    //加法方法

    public double add(int num1,int num2) {

        result=num1+num2;

        return result;

    }

    //减法方法

    public double minus(int num1,int num2) {

        result=num1-num2;

        return result;

    }

    //乘法方法

    public double multiple(int num1,int num2) {

        result=num1*num2;

        return result;

    }

    public double divide(int num1,int num2) {

        result=num1/num2;

        return result;

    }

    public void operation() {

        Scanner input = new Scanner(System.in);

        System.out.println("请选择运算方法：1.(加法)2.(减法)3.(乘法)4.(除法)");

        int select=input.nextInt();

        switch(select) {

        case 1:

            add(num1, num2);

            break;

        case 2:

            minus(num1, num2);

            break;

        case 3:

            multiple(num1, num2);

            break;

        case 4:

            divide(num1, num2);

        }

    }

    public static void main(String[] args) {

        Calculator calc = new Calculator();

        Scanner input = new Scanner(System.in);

        System.out.println("请输入第一个数:");

        calc.num1=input.nextInt();

        System.out.println("请输入第二个数:");

         calc.num2=input.nextInt();

        calc.operation();

        System.out.println("运算结果为:"+calc.result);

    }

}

4.模拟ATM机进行账户余额查询，编写账户类，属性为账户余额，方法为查询余额，编写测试类，显示账户余额
代码如下:

public class Account {      
//账户类
    double Money;   //账户余额
    public void show(){
            System.out.println("账户余额为:"+Money);
    }

}

import java.util.*;
public class cesi {
//测试类
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner (System.in);
        Account n = new Account();
        int money = 100000;
        System.out.println("账户总额:"+money);
        System.out.print("取款:");
        double a = input.nextDouble();
        n.Money = money-a;
        n.show();
    }

}

5.现有电视商品价格竞猜活动，活动的规则，随机出现一个商品名，用户猜测他的价值，如果再规定次数内猜对，便可获得此商品，模拟竞猜活动
代码如下:

import java.util.*;
public class QuessMachine {
    String name; // 商品名称
    double money; // 商品价格

    public void initial() { // QuessMachine类中initial方法定义商品信息
        int random = (int) (Math.random() * 10); // 产生随机数，来选定一款商品
        switch (random) {
        case 0:
        case 1:
        case 2:
        case 3:
            name = "公主电动车";
            money = 3000;
            break;
        case 4:
        case 5:
        case 6:
            name = "雷神笔记本";
            money = 7199;
            break;
        case 7:
        case 8:
        case 9:
            name = "美的*空调";
            money = 7999;
            break;
        default:
            break;
        }
    }

    public void guess() {
        System.out.print("\n请猜测“" + name + "”的价格:");
        Scanner input = new Scanner(System.in);
        double jiage = input.nextDouble();
        boolean can = false;
        for (int i = 0; i < 4; i++) { // 循环4次
            if (jiage == money) {
                System.out.println("恭喜您，猜对了！获得" + name + "一台！");
                can = true;
                break;
            } else if (jiage > money) {
                System.out.println("再小点！");
            } else {
                System.out.println("再大点！");
            }
            System.out.print("再猜一次吧:");
            jiage = input.nextInt();
        }
        if (!can) {
            System.out.println("4次均没有猜对，下次再努力吧！");
        }
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        QuessMachine js = new QuessMachine();
        js.initial();
        js.guess();
    }

}