2/21-3/1

商城登录页面

完善了一下，注册下密码核对部分

  1. package com.woniuxu.day03;
  2. import java.util.Scanner;
  4. public class Demo1 {
  5.     public static void main(String [] args){
  6.         Scanner scanner = new Scanner(System.in);
  7.         //1.模拟一个登录注册退出的功能实现
  8.         loadUI();
  9.         //2.使用switch……case实现
  10.         String option = scanner.nextLine();
  11.         switch(option){
  12.             case "1":
  13.                 loginUI();//调用外部代码
  14.                 mainUI();
  15.                 break;
  16.             case "2":
  17.                 registerUI();
  18.                 break;
  19.             case "0":
  20.                 System.out.println("正在推出程序，请稍后……");
  21.                 System.exit(5);
  22.                 break;
  23.             default:
  24.                 System.out.println("您的输入有误");
  25.         }
  26.         scanner.close();
  27.     }
  28.     /**
  29.      * 开机ui
  30.      */
  31.     public static void loadUI(){
  32.         System.out.println("*******欢迎登陆*******");
  33.         System.out.println("\t1.登录");
  34.         System.out.println("\t2.注册");
  35.         System.out.println("\t0.退出");
  36.         System.out.println("———————————————————");
  37.     }
  38.     /**
  39.      * 1.登录验证的方法
  40.      */
  41.     public static void loginUI(){
  42.         Scanner scanner = new Scanner(System.in);
  43.         System.out.println("---欢迎进入商城登陆系统---");
  44.         while(true){
  45.             System.out.println("请输入用户名");
  46.             String username = scanner.nextLine();
  47.             System.out.println("请输入密码");
  48.             String password = scanner.nextLine();
  49.             //进行登录逻辑验证
  50.             if("admin".equals(username) && "123".equals(password)){
  51.                 break;
  52.             }else{
  53.                 System.out.println("您的输入有误，请重新输入");
  54.             }
  55.         }
  56.         System.out.println("登录成功");
  57.         scanner.close();    
  58.     }
  59.     /**
  60.      * 2.注册验证的方法
  61.      */
  62.     public static void registerUI(){
  63.         Scanner scanner = new Scanner(System.in);
  64.         System.out.println("欢迎进入商城注册页面");
  65.         System.out.println("请输入您的用户名:");
  66.         String username = scanner.nextLine();
  67.         String psw;
  68.         String psw1;
  69.         while(true){
  70.             System.out.println("请输入您的密码:");
  71.             psw = scanner.nextLine();
  72.             System.out.println("请再次输入您的密码");
  73.             psw1 = scanner.nextLine();
  74.             if(psw.equals(psw1)){
  75.                 break;
  76.             }else{
  77.                 System.out.println("您俩次输入的密码不一致，请重新输入");
  78.             }
  79.         }
  80.         System.out.println("您已注册成功");
  81.         System.out.println("您的用户名为:"+username+"您的密码为:"+ psw);
  82.         scanner.close();
  83.     }
  84.     /**
  85.      * 商城主页面
  86.      */
  87.     public static void mainUI(){
  88.         System.out.println("欢迎进入商城页面");
  89.     }
  90. }

输入年月日，计算这是此年第几天

  1. package com.woniuxy.demo_if;
  2. import java.util.Scanner;
  3. import java.util.InputMismatchException;
  5. public class Test4 {
  6.     public static void main(String[] args) {
  7.         Scanner scanner = new Scanner(System.in);
  8.         int year = 0;
  9.         System.out.println("请您输入一个年份：");
  10.         while(true){
  11.             try{
  12.                 year = scanner.nextInt();
  13.                 break;
  14.             }catch(InputMismatchException e){
  15.                 System.out.println("您输入的格式有误请重新输入");
  16.                 scanner.next();//两种理解①将nextInt中的错误输出清除②next清空缓存输入新的内容作为下一次的nextInt的输入
  17.             }
  18.         }    
  19.         boolean flag = isLeapYear(year);//默认非闰年
  20.         int month = 0;
  21.         System.out.println("请输入一个月份：");
  22.         while(true){
  23.             try{
  24.                 month = scanner.nextInt();
  25.                 if(month < 0 || month >12) {
  26.                     System.out.println("您输入的月份有误，请重新输入：");
  27.                     continue;
  28.                 }
  29.                 break;
  30.             }catch(InputMismatchException e){
  31.                 System.out.println("您输入的格式有误请重新输入");
  32.                 scanner.next();
  33.             }
  34.         }    
  35.         int day = 0;
  36.         System.out.println("请输入一个日期：");
  37.         while(true){
  38.             try{
  39.                 day = scanner.nextInt();
  40.                 if(day < 0) {
  41.                     System.out.println("日期必须时正，请重新输入");
  42.                     continue;
  43.                 }else if(month == 2 && flag == true && day >= 30) {
  44.                     System.out.println("闰年2月只有29天，请重新输入");
  45.                     continue;
  46.                 }else if(month == 2 && flag == false && day >= 29){
  47.                     System.out.println("非闰年2月只有28天，请重新输入");
  48.                     continue;
  49.                 }else if(month == 4 || month == 6 || month == 9 || month == 11 && day >=31) {
  50.                     System.out.println(month+"月只有30天，请重新输入");
  51.                     continue;
  52.                 }else if(month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12 && day >=32){
  53.                     System.out.println(month+"月只有31天，请重新输入");
  54.                     continue;
  55.                 }
  56.                 break;
  57.             }catch(InputMismatchException e){
  58.                 System.out.println("您输入的格式有误请重新输入");
  59.                 scanner.next();
  60.             }
  61.         }    
  62.         int days = 0;
  63.         switch(month){
  64.             default:
  65.                 System.out.println("您输入的有误");
  66.             case 12:
  67.                 days += 30;
  68.             case 11:
  69.                 days += 31;
  70.             case 10:
  71.                 days += 30;
  72.             case 9:
  73.                 days += 31;    
  74.             case 8:
  75.                 days += 31;        
  76.             case 7:
  77.                 days += 30;    
  78.             case 6:
  79.                 days += 31;
  80.             case 5:
  81.                 days += 30;    
  82.             case 4:
  83.                 days += 31;
  84.             case 3:
  85.                 if(flag){
  86.                     days += 29;
  87.                 }else{
  88.                     days += 28;
  89.                 }
  90.             case 2:
  91.                 days += 31;
  92.             case 1:        
  93.         }
  94.         days = days + day;
  95.         System.out.println(year+"年"+month+"月"+day+"日，共有"+days+"天");
  96.         scanner.close();
  97.     }
  98.     public static boolean isLeapYear(int year){//判断是否为闰年
  99.         if(year % 4 == 0 && year % 100 ==0 || year % 400 == 0 ){
  100.             return true;
  101.         }else{
  102.             return false;
  103.         }
  104.     }
  105. }

冒泡排序

package com.woniuxy.demo2;
import java.util.Scanner;
import java.util.InputMismatchException;

public class Test2 {
    public static void main(String[] args) {
//        int[] a = {12,34,23,56,69,38,47};
        int[] a = buildArr();
        for(int i=0; i<a.length-1; i++) {
            for(int j = 0; j<a.length-i-1; j++) {
                 exchangeArr(a, j, j+1);//外部定义了一个叫exchange的方法用于交换数组内容
            }
        }
        for(int i:a) {
            System.out.print(i + " ");
        }
    }
    public static int[] exchangeArr(int[] Arr,int index_a, int index_b) {//交换数组下的数据
    int temp = 0;
    if(Arr[index_a] > Arr[index_b]) {
        temp = Arr[index_a];
        Arr[index_a] = Arr[index_b];
        Arr[index_b] = temp;
    }
    return Arr;
    }
    public static int[] buildArr() {//创建一个数组
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入您要创建的数组大小：");
        int num = 0;
        while(true) {
            try {
                num = scanner.nextInt();
                break;
            }catch(InputMismatchException e){
                System.out.println("您输入的不是整数，请重新输入：");
                scanner.nextLine();
            }
        }
        System.out.println("现在录入数组");
        int[] Arr = new int[num];
        for(int i = 0; i < num; i++) {
            System.out.println("请输入一个整数：");
            try {
                Arr[i] = scanner.nextInt();
            }catch(InputMismatchException e) {
                System.out.println("您输入的不是整数，请重新输入：");
                scanner.nextLine();
                i--;
            }
        }
        scanner.close();
        return Arr;
    }
}

猜拳游戏

要求三局两胜

package com.woniuxy.Demo1;
import java.util.Random;
import java.util.Scanner;

public class Test1 {
    static Scanner scanner = new Scanner(System.in);
    static int flag = 0;//标记输-1赢1平0

    public static void main(String[] args) {
        fingerGame();//猜拳
        scanner.close();
    }

    public static void fingerGame() {    
        Random rand = new Random();
        int count = 0;
        while(count <3 ) {//三局
            UI();
            int player = scanner.nextInt();
            scanner.nextLine();
            int computer = rand.nextInt(3)+1;
            single(player, computer);
            if(flag == 2){//连赢两把
                break;
            }
            if(flag == -2){//连输两把
                break;
            }
            count++;
        }
        if(flag > 0) {
            System.out.println("您赢了");
        }
        else if(flag < 0) {
            System.out.println("您输了");
        }else {
            System.out.println("平局");//平平平，输1赢1平1
        }    
    }    

    public static void UI() {
        System.out.println("------- 欢迎进入猜拳游戏 --------");
        System.out.println("\t    1.剪刀");
        System.out.println("\t    2.石头");
        System.out.println("\t    3.布");
        System.out.println("------请玩家按对应数字完成出拳  ----");
    }

    public static int single( int player, int computer) {
        if(computer == 1) {
            System.out.println("电脑出了剪刀");
            switch(player) {
                case 1://剪刀
                    System.out.println("这一局平局");
                    break;
                case 2://石头
                    System.out.println("您这一局赢了");
                    flag++;
                    break;
                case 3://布
                    System.out.println("您这一局输了");
                    flag--;
                    break;
            }
        }else if(computer == 2) {
            System.out.println("电脑出了石头");
            switch(player) {
                case 1://剪刀
                    System.out.println("您这一局输了");
                    flag--;
                    break;
                case 2://石头
                    System.out.println("这一局平局");
                    break;
                case 3://布
                    System.out.println("您这一局赢了");
                    flag++;
                    break;
            }
        }else if(computer == 3) {
            System.out.println("电脑出了布");
            switch(player) {
                case 1://剪刀
                    System.out.println("您这一局赢了");
                    flag++;
                    break;
                case 2://石头
                    System.out.println("您这一局输了");
                    flag--;
                    break;
                case 3://布
                    System.out.println("这一局平局");
                    break;
            }
        }
        return flag;
    }
}

要求一定要决出胜负

//10.猜拳（不限次数，但一定会决出结果）
package com.woniuxy.HomeWork;

import java.util.Random;
import java.util.Scanner;

public class homeWork2 {
    static Scanner scanner = new Scanner(System.in);
    static int win = 0;//记录赢了几局
    static int lose = 0;//记录输了几局
    static int dogfall = 0;//记录平了几局

    public static void main(String[] args) {
//        石头剪刀布
        fingerGame();
        scanner.close();
    }

    public static void fingerGame() {    
        Random rand = new Random();
        while(win != 2 && lose != 2 ) {//只有输赢，没有平局
            UI();
            int player = scanner.nextInt();
            scanner.nextLine();
            int computer = rand.nextInt(3)+1;
            single(player, computer);
        }
        if(win>=2) {
            System.out.println("您赢了");
        }
        else if(lose >= 2) {
            System.out.println("您输了");
        }else {
            System.out.println("平局");
        }    
    }    

    public static void UI() {
        System.out.println("------- 欢迎进入猜拳游戏 --------");
        System.out.println("\t    1.剪刀");
        System.out.println("\t    2.石头");
        System.out.println("\t    3.布");
        System.out.println("------请玩家按对应数字完成出拳  ----");
    }

    public static void single( int player, int computer) {
        if(computer == 1) {
            System.out.println("电脑出了剪刀");
            switch(player) {
                case 1://剪刀
                    System.out.println("这一局平局");
                    dogfall++;
                    break;
                case 2://石头
                    System.out.println("您这一局赢了");
                    win++;
                    break;
                case 3://布
                    System.out.println("您这一局输了");
                    lose++;
                    break;
            }
        }else if(computer == 2) {
            System.out.println("电脑出了石头");
            switch(player) {
                case 1://剪刀
                    System.out.println("您这一局输了");
                    lose++;
                    break;
                case 2://石头
                    System.out.println("这一局平局");
                    dogfall++;
                    break;
                case 3://布
                    System.out.println("您这一局赢了");
                    win++;
                    break;
            }
        }else if(computer == 3) {
            System.out.println("电脑出了布");
            switch(player) {
                case 1://剪刀
                    System.out.println("您这一局赢了");
                    win++;
                    break;
                case 2://石头
                    System.out.println("您这一局输了");
                    lose++;
                    break;
                case 3://布
                    System.out.println("这一局平局");
                    dogfall++;
                    break;
            }
        }
    }
}

10.//(三局两胜制猜拳)
package com.woniuxy.Demo1;
import java.util.Random;
import java.util.Scanner;

public class Test1 {
    static Scanner scanner = new Scanner(System.in);
    static int flag = 0;//标记输-1赢1平0

    public static void main(String[] args) {
        fingerGame();//猜拳
        scanner.close();
    }

    public static void fingerGame() {    
        Random rand = new Random();
        int count = 0;
        while(count <3 ) {//三局
            UI();
            int player = scanner.nextInt();
            scanner.nextLine();
            int computer = rand.nextInt(3)+1;
            single(player, computer);
            if(flag == 2){//连赢两把
                break;
            }
            if(flag == -2){//连输两把
                break;
            }
            count++;
        }
        if(flag > 0) {
            System.out.println("您赢了");
        }
        else if(flag < 0) {
            System.out.println("您输了");
        }else {
            System.out.println("平局");//平平平，输1赢1平1
        }    
    }    

    public static void UI() {
        System.out.println("------- 欢迎进入猜拳游戏 --------");
        System.out.println("\t    1.剪刀");
        System.out.println("\t    2.石头");
        System.out.println("\t    3.布");
        System.out.println("------请玩家按对应数字完成出拳  ----");
    }

    public static int single( int player, int computer) {
        if(computer == 1) {
            System.out.println("电脑出了剪刀");
            switch(player) {
                case 1://剪刀
                    System.out.println("这一局平局");
                    break;
                case 2://石头
                    System.out.println("您这一局赢了");
                    flag++;
                    break;
                case 3://布
                    System.out.println("您这一局输了");
                    flag--;
                    break;
            }
        }else if(computer == 2) {
            System.out.println("电脑出了石头");
            switch(player) {
                case 1://剪刀
                    System.out.println("您这一局输了");
                    flag--;
                    break;
                case 2://石头
                    System.out.println("这一局平局");
                    break;
                case 3://布
                    System.out.println("您这一局赢了");
                    flag++;
                    break;
            }
        }else if(computer == 3) {
            System.out.println("电脑出了布");
            switch(player) {
                case 1://剪刀
                    System.out.println("您这一局赢了");
                    flag++;
                    break;
                case 2://石头
                    System.out.println("您这一局输了");
                    flag--;
                    break;
                case 3://布
                    System.out.println("这一局平局");
                    break;
            }
        }
        return flag;
    }
}