JAVA理解逻辑程序的书上全部重要的习题

今天随便翻翻看以前学过JAVA理解逻辑程序的书上全部练习,为了一些刚学的学弟学妹,所以呢就把这些作为共享了.

希望对初学的学弟学妹有所帮助!

 例子:升级“我行我素购物管理系统”，实现购物结算功能
 代码：

 public class OneDay {
     public static void main(String[] args) {
         int shirtPrice=245;
         int shoePrice=570;
         int pADpRICE=320;
         int ShoeNo=1;
         int shirtNo=2;
         int padNo=1;
         double discount=0.8;
         /*
          * 计算消费总金额
          *
          * */
         double finalPay=(shirtPrice*shirtNo+        shoePrice*ShoeNo+shoePrice+pADpRICE*padNo)*discount;
         System.out.println("消费总金额："+finalPay);
     }
 }

 例子:升级“我行我素购物管理系统”，实现打印购物小票和计算积分功能
 public class OneDay {
     public static void main(String[] args) {
         int shirtPrice=245;
         int shoePrice=570;
         int pADpRICE=320;
         int ShoeNo=1;
         int shirtNo=2;
         int padNo=1;
         double discount=0.8;
         double finalPay=(shirtPrice*shirtNo+shoePrice*ShoeNo+shoePrice+pADpRICE*padNo)*discount;
         double Sum=1800;
         double SuM=Sum-finalPay;
         //积分
         int Point=(int)finalPay*3/100;
     System.out.println("**********消费单***********");
     System.out.println("购买物品\t单价\t个数\t金额");
     System.out.println("T血\t￥245\t2\t￥490");
     System.out.println("网球鞋\t￥570\t1\t￥570");
     System.out.println("网球拍\t￥320\t1\t￥320\n");
     System.out.println("折扣：\t"+discount);
     System.out.println("消费总金额："+finalPay);
     System.out.println("实际交费\t￥"+Sum);
     System.out.println("找钱\t￥"+SuM);
     System.out.println("积分\t￥"+Point);
     }
 }

 //我行我素,幸运抽奖
 public class OneDay {
     public static void main(String[] args) {
         int cusNO;//客户会员号
         System.out.println("请输入四位会员卡号:");
         Scanner input=new Scanner(System.in);//导包
         cusNO=input.nextInt();
         //获得 每位数字
         int gewei=cusNO%10;
         int shiwei=cusNO%10%10;
         int baiwei=cusNO/100%10;
         int qianwei=cusNO/1000;
         int sum=gewei+shiwei+baiwei+qianwei;
         System.out.println("会员卡号:"+cusNO+"各位之和:"+sum);
         boolean isluck=sum>20;//boolean的判断为true或false
         System.out.println("是幸运客户吗?"+isluck);
     }
 }

 //我行我素,判断商品判断商品折扣价格
     public static void main(String[] args) {
         int shirtPrice=245;
         int shoePrice=570;
         int padPrice=320;
         //用户输入折扣
         Scanner input=new Scanner(System.in);
         System.out.println("请输入折扣：");
         double discount=input.nextDouble();
         //计算商品的享受价格
         double shirtPriceDis=shirtPrice*discount;
         double shoePriceDis=shoePrice*discount;
         double padPriceDis=padPrice*discount;
         //判断商品价格是否低于100
         boolean shirtPricebool=shirtPriceDis<100;
         boolean shoePricebool=shoePriceDis<100;
         boolean padPricebool=padPriceDis<100;
         System.out.println("T血折扣低于100吗？"+shirtPricebool);
         System.out.println("网球鞋折扣低于100吗？"+shoePricebool);
         System.out.println("网球拍折扣低于100吗？"+padPricebool);

 小明左右手分别拿出两张牌
 public static void main(String[] args) {
     int num;
     int num1;
     System.out.println("输出互换前手中的纸牌 ：");

          Scanner input=new Scanner(System.in);
          System.out.println("左手中的纸牌:\n");
         num=input.nextInt();
         System.out.println("输出右手的纸牌：");
             num1=input.nextInt();
             System.out.println("**************************************");
             System.out.println("输出互换后手中的纸牌 ：");
             int temp;
             temp=num;
             num=num1;//
             num1=temp;//
             System.out.println("左手中的纸牌:"+num);
             System.out.println("输出右手的纸牌："+num1);
     }
 }

  double sheshi=0;
             int num=0;//循环次始值
             double huashi;
             do{
                 num++;
                 sheshi+=20;
                 huashi=sheshi*9/5+32;
                 System.out.println("摄氏温度:"+sheshi+"度,华氏温度:"+huashi+"度");
             }while(num<=9);//循环次条件
             System.out.println("结束");

 public static void main(String[] args) {
          Scanner input=new Scanner(System.in);
         /*
          * 产生随机数
          * */
          int random=(int)(Math.random()*10);
          System.out.println("************购物系统抽奖************\n");
          System.out.println("请输入4位会员号：");
          int cusNo=input.nextInt();
          /*
           * 获得百分位
           * */
          int baiwei=cusNo/100%10;
          /*
           * 判断该会员是否是幸运会员
           * */
          if (baiwei==random)
              System.out.println(cusNo+"是幸运客户，获得笔记本一个");

         }else {
             System.out.println(cusNo+"号客户"+"谢谢");
         }
     }
 public static void main(String[] args) {

          Scanner input=new Scanner(System.in);
          System.out.println("请输入第一个整数");
          int a=input.nextInt();
          System.out.println("请输入第二个整数");
          int b=input.nextInt();
          System.out.println("请输入第三个整数");
          int c=input.nextInt();
          /*第一道排序*/
          System.out.println("第一道排序");
          if (a<b&&a<c) {
             System.out.print(a);
             System.out.print(b);
             System.out.println(c);
         }
          /*第二道排序*/
          System.out.println("第二道排序");
          if (b<c) {
             System.out.print(a);
             System.out.print(b);
             System.out.println(c);
         }
          System.out.println("每个变量的值");
             System.out.println(a);
             System.out.println(b);
             System.out.println(c);
     }
     public static void main(String[] args) {
         int price = 5000;  // 机票的原价
         int month;  // 出行的月份
         int type;   // 头等舱为1,经济舱为2
         Scanner input = new Scanner(System.in);
         System.out.println("请输入您出行的月份：1～12");
         month = input.nextInt();
         System.out.println("请问您选择头等舱还是经济舱？头等舱输入1，经济舱输入2");
         type = input.nextInt();

         switch(month/10){
             case 1:
             case 2:
             case 3:
                  if (type == 1) // 头等舱
                     {
                         System.out.println("您的机票价格为："+ price * 0.6);
                     }
                     else if (type == 2)  // 经济舱
                     {
                         System.out.println("您的机票价格为："+ price * 0.3);
                     }
                 break;
             case 0:
             case 4:
             case 5:
             case 6:
             case 7:
             case 8:
             case 9:
                  if (type == 1) // 头等舱
                     {
                         System.out.println("您的机票价格为："+price * 0.9);
                     }
                     else if (type == 2)  // 经济舱
                     {
                         System.out.println("您的机票价格为："+ price * 0.8);
                     }
                 break;
             default:
                 System.out.println("请正确输入成绩！");
                 break;
         }

 public static void main(String[] args) {
     Scanner input=new Scanner(System.in);
     System.out.println("*******************计算器****************");
     int result=0;
     char opt='*';   //定义操作符
     System.out.println("请输入第一个操作数：");
     if (input.hasNextInt() == true) {
         int num1 = input.nextInt();
         System.out.println("请输入第二个操作数：");
         if (input.hasNextInt() == true) {
             int num2 = input.nextInt();
             switch (opt) {
             case '+':
                 result=num1+num2;
                 break;
             case '-':
                 result=num1-num2;
                 break;
             case '*':
                 result=num1*num2;
                 break;
             case '/':
                 result=num1/num2;
                 break;
             default:
                 System.out.println("输入错误。");
                 break;
             }
             System.out.println("计算结果："+num1+""+opt+num2+"="+result);
         }else {
             System.out.println("请输入正确的数字!");
         }
     } else {
         System.out.println("请输入正确的数字!");
     }
 public static void main(String[] args) {
     Scanner input=new Scanner(System.in);
     System.out.println("*******************系统*************");
     System.out.println("1.进入");
     System.out.println("2.退出");
     System.out.println("请输入数字");
     /*
      * 通过调用Scanner对象的hasNextInt()，来判断输入的数字是否合法
      * */
     if (input.hasNextInt()==true) {
         int num=input.nextInt();
         switch (num) {
         case 1:
             System.out.println("don't go");
             break;
     case 2:
         System.out.println("let go");
             break;
         default:
             System.out.println("错误");
             break;
         }
     }

 public static void main(String[] args) {
         //方法一：
         /*100以内的偶数之和
          * */
     int num=0;
     int sum=0;
     while (num<=100) {
         if (num%2==0) {
             sum+=num;
         }
         num++;
     }
             System.out.println(sum);
             //方法二：
             while (num<=100) {
                     sum+=num;
                   num+=2;
             }
                     System.out.println(sum);

      }
 public static void main(String[] args) {
         Scanner input=new Scanner(System.in);
         System.out.println("请选择编号：\n 1.T血，2.网球鞋，3.网球拍");

         double price=0.0;
         String name="";
         int goodsno=0;
         String answer="y";
         while ("y".equals(answer)) {
             System.out.println("请输入编号：");
             goodsno=input.nextInt();
             switch (goodsno) {
             case 1:
                 name="djs";
                 price=245.0;
                 break;
             case 2:
                 name="fd";
                 price=570.0;
                 break;
             case 3:
                 name="res";
                 price=320.0;
                 break;
             default:
                 break;
             }
             System.out.println(name+"\t"+"￥"+price+"\t");
             System.out.println("是否继续？（y/n）");
             answer=input.next();
         }
         System.out.println("程序结束");
     }
 public static void main(String[] args) {
         //01.列出商品清单
                 System.out.println("1.T恤 2.网球鞋  3.网球拍");
                 //02.肯定要用到循环
                 String answer="";
                 //定义折扣
                 double discount=0.8;
                 //保存总金额
                 double money=0;
                 Scanner input=new Scanner(System.in);

                 do{
                     System.out.println("请输入商品编号");

                     int proNo=input.nextInt();
                     System.out.println("请输入商品数量");
                     int proNum=input.nextInt();
                     String proName="";
                     double proPrice=0;
                     switch (proNo) {
                     case 1:
                         //列出第一个商品的信息
                         //名称
                          proName="T恤";
                         //价格
                          proPrice=25;
                         break;
                     case 2:
                          proName="网球鞋";
                          proPrice=260;
                         break;
                     case 3:
                          proName="网球拍";
                          proPrice=200;
                         break;
                     default:
                         break;
                     }
                     //03.输出当前所购买商品的详情
                     double sum=proPrice*proNum;
                     money=money+sum;
                     System.out.println(proName+"\t￥"+proPrice+"\t数量"+proNum+"\t小计"+sum);
                     System.out.println("是否继续?(y/n)");
                     answer=input.next();
                 }while(answer.equals("y"));
                 //出了循环，意味着用户要结账，离开商店
                 System.out.println("折扣："+discount);
                 //应付金额
                 double yingfuMoney=money*discount;
                 System.out.println("应付金额："+yingfuMoney);
                 System.out.println("请输入您的支付金额：");
                 int userMoney=input.nextInt();
                 //找零
                 double lastMoney=userMoney-yingfuMoney;
                 //最好判定一下
                 if (userMoney>=yingfuMoney) {
                     System.out.println("找零"+lastMoney);
                 } 

             //用户录入一堆数字，拎出最大和最小值
         Scanner input=new Scanner(System.in);
         System.out.println("爷爷，请您输入一个数字呗");
         int num=input.nextInt();
         //最大值
         int max=num;
         //最小值
         int min=num;
         while(num!=0){
             if(num>max){
                 max=num;
             }
             if(num<min){
                 min=num;
             }
             System.out.println("爷爷，请您输入一个数字呗");
             num=input.nextInt();
         }
         System.out.println("最大值是"+max+"\t最小值是"+min);

 public static void main(String[] args) {
             Scanner input=new Scanner(System.in);
     int cource=0;
         int number=0;//班级总人数
           int sum=0;//大于80分的人数
           System.out.println("总人数：");
          number =input.nextInt();
          for (int i =0; i <number; i++) {
             System.out.println("输入第"+(i+1)+"位成绩");
             cource=input.nextInt();
             if (cource<80) {
                 continue;
             }
             sum++;
         }
          System.out.println("80分以上的人数"+sum);
          double rate=(double)sum/number*100;
          System.out.println("比例："+rate+"%");
     }        

 public static void main(String[] args) {
             Scanner input=new Scanner(System.in);
         int sum=0;
         int coure=0;
         int avg=0;
         boolean isnegi=false;
         //Scanner input=new Scanner(System.in);
         for (int i =0; i <5; i++) {
             System.out.println("请输入5门课程的"+(i+1)+"门课的成绩：");
             coure=input.nextInt();
             if (coure<0) {
                 isnegi=true;
                 break;
             }
             sum+=coure;
         }
         if (isnegi) {
             System.out.println("成绩输入错误");
         }else {
             avg=sum/5;
             System.out.println("总成绩："+sum);
             System.out.println("平均成绩："+avg);
         }

 public static void main(String[] args) {
             Scanner input=new Scanner(System.in);
 int pwd=123456;//密码
         String name="jim";//户名s
         for (int i = 0; i <3; i++) {
             System.out.println("请输入用户名：");
             String Rname=input.next();
             System.out.println("请输入密码：");
             int Rpwd=input.nextInt();
             if (Rname.equals(name)&&Rpwd==pwd) {
                 System.out.println("欢迎登陆系统");

             }else {
                 System.out.println("输入错误!您还有"+(3-(i+1))+"次机会");
                 System.out.println("对不起！"+((i+1))+"次错误！");
                 continue;

             }
         }
         int rabbit;//兔子
          int chicken;//小鸡
          for(rabbit=1;rabbit<14;rabbit++){
           chicken=35-rabbit;
           if((rabbit*4+chicken*2)==94)
            System.out.println("兔子:"+rabbit+"\t小鸡:"+chicken);
          }

 for (int i = 1; i <=100; i++) {

             if (i%3==0) {
                 System.out.println("Flip");
             }
                 else {
                     System.out.println(i);
                 }
             if (i%5==0) {
                 System.out.println("Flop");
             }
                 else {
                     System.out.println(i);
                 }
          if (i%3==0&&i%5==0) {
                 System.out.println("FlipFlop");
             }else {
                 System.out.println(i);
             }
         }

 int men;
         int women;
         for( men=0;men<=10;men++){
             for( women=0;women<=30;women++){
                 if(30-men-women >= 0){
                     int count = 3*men + 2*women + 1*(30-men-women) ;
                     if(count == 50){
                         System.out.println("男人:" + men+",女人:"+women+",小孩:" +(30-men-women)) ;
                     }
                 }
             }
         }

 public static void main(String[] args) {
         Scanner input=new Scanner(System.in);
         /*
          *选择游戏
          *
          * */
         System.out.println("欢迎进入青鸟迷你戏平台");
         System.out.println("");
         System.out.println("请选择你喜爱的游戏");
         System.out.println("----------------------------");
         System.out.println("1.斗地主");
         System.out.println("2.斗牛");
         System.out.println("3.泡泡龙");
         System.out.println("4.连连看");
         System.out.println("-----------------------------");
         System.out.println("请选择,输入数字:");
         int num = input.nextInt();
         switch (num) {
         case 1:
             System.out.println("您已进入斗地主房间!");
             break;
         case 2:
             System.out.println("您已进入斗牛房间!");
             break;
         case 3:
             System.out.println("您已进入泡泡龙房间!");
             break;
         case 4:
             System.out.println("您已进入连连看房间!");
             break;
         }
                 /*
                  * 玩游戏升级
                  *
                  * */
         int score = 0;
         int Num = 1;
         String answer;
         do {
             System.out.println("您正在玩" + Num + "局,输入您的成绩为:");
             score = input.nextInt();
             if (score > 80) {
             }
             Num++;
             if (Num > 5) {
                 System.out.println("游戏结束!!");
                 System.out.println("恭喜你,通过一级");

             } else {
                 System.out.println("继续玩下一局吗?(yes/no)");
                 answer = input.next();
                 if (answer.equals("no")) {
                     System.out.println("您已中途退出游戏");
                     System.out.println("对不起,您未能晋级,继续加油呀!");
                     break;
                 } else {
                     System.out.println("进入下一局");
                 }
             }
         } while (Num <= 5);

         /*玩游戏并支付游戏币
          *
          * */
         int money;
         double discount1 = 0.5;
         double discount2 = 0.8;
         int m1 = 10;
         int m2 = 20;
         System.out.println("请您选择玩的游戏类型:");
         System.out.println("1.牌类");
         System.out.println("2.休闲竞技类");
         int num1 = input.nextInt();
         System.out.println("请您输入游戏时长:");
         int time = input.nextInt();
         switch (num1) {
         case 1:
             if (time > 10) {
                 System.out.println("您玩的是牌类游戏,时长是:" + time + "小时,可以享受5折优惠");
                 money = (int) (time * m1 * discount1);
                 System.out.println("您需支付" + money + "个游戏币");

             } else {
                 System.out.println("您玩的是牌类类游戏,时长是:" + time + "小时,可以享受8折优惠");
                 money = (int) (time * m1 * discount2);
                 System.out.println("您需支付" + money + "个游戏币");
             }
             break;
         case 2:
             if (time > 10) {
                 System.out.println("您玩的是休闲类游戏,时长是:" + time + "小时,可以享受5折优惠");
                 money = (int) (time * m2 * discount1);
                 System.out.println("您需支付" + money + "个游戏币");

             } else {
                 System.out.println("您玩的是休闲类游戏,时长是:" + time + "小时,可以享受8折优惠");
                 money = (int) (time * m2 * discount2);
                 System.out.println("您需支付" + money + "个游戏币");
             }
             break;
         }
         /*统计游戏点击率
          *
          * */
         int j = 0;
         int num2 =0;
         for (int i = 1; i <= 4; i++) {
             System.out.println("请输入第" + i + "个游戏的点击率:");
             num2 = input.nextInt();
             if (num2 <= 100) {
                 continue;
             }
             j++;
         }
         System.out.println("点击率大于100的游戏数是:" + j);
         double rate = (double)j/ 4 * 100;
         System.out.println("点击率大于100的游戏所占的比例是:" + rate + "%");
         /*添加用户信息
          *
          * */
         int a=0,age=0,b=0;
         System.out.println("请输入要登录用户的数量:");
         int num3=input.nextInt();
         for (int i=0;i<num3;i++){
             System.out.println("请输入用户编号<4位整数>:");
              a=input.nextInt();
              System.out.println("请输入用户年龄:");
              age=input.nextInt();
              System.out.println("请输入用户积分:");
              b=input.nextInt();
              if(age<10){
                  System.out.println("很抱歉,你年龄不适合玩游戏\n录入失败");
              }else{
              System.out.println("您输入的会员信息是:");
                 System.out.println("用户编号"+a+"\t用户年龄"+age+"\t用户积分"+b);
         }
         }

     }

 public static void main(String[] args) {            

         Scanner input=new Scanner(System.in);
 System.out.println("请输入整数：");
         int in=input.nextInt();
         int result=1;
         System.out.print(in+"!=");
         for (int i = 1; i<=in; i++) {
                         System.out.print(i);
             if (i<in) {
                 System.out.print("*");

             }
             result=result*i;

         }
         System.out.print("="+result);
         }

 public static void main(String[] args) {
         Scanner input=new Scanner(System.in);
         int num = 0; //个数
         int sum = 0; //和
         for(int i = 0;i <= 100;i ++) {
         if(i % 7!= 0) {
         num ++;
         sum = sum+i;
         System.out.print(i + "\t");
         if(num % 4 == 0)
         System.out.println();
         }
         }
         System.out.println();
         System.out.println("总和为:"+sum);

         Scanner input=new Scanner(System.in);

         int scores []=new int[5];
         int sum=0;

         System.out.println("请输入五位同学的成绩：");
         for (int i = 0; i < scores.length; i++) {
             scores[i]=input.nextInt();
             sum+=scores[i];//成绩累加
         }
         System.out.print("平均分："+sum/scores.length);

 int scores []=new int[]{90,80,100,95,90};
         System.out.println("请修改第三位同学的成绩为98:");
         scores[2]=98;//数组下标
         System.out.println("修改后，五位同学的成绩：");
         for (int i = 0; i < scores.length; i++) {
             System.out.print(scores[i]+" ");
         }

 public static void main(String[] args) {
         Scanner input=new Scanner(System.in);
         double sum=0;
         double scores[]=new double[5];
         for (int i = 0; i < scores.length; i++) {
             System.out.print("请输入第"+(i+1)+"笔金额的记录:");
             scores[i]=input.nextDouble();
              sum+=scores[i];
         }
         System.out.println("序号\t\t"+"金额(元)");
         for (int i = 0; i < scores.length; i++) {
             System.out.print((i+1)+"\t\t");
         System.out.println(scores[i]);
         }
             System.out.println("总金额：\t\t"+sum);

     public static void main(String[] args) {
     Scanner input=new Scanner(System.in);
     int scores []=new int[5];
     System.out.println("请输入5位同学的成绩：");
     //录入成绩
     for (int i = 0; i < scores.length; i++) {
         scores[i]=input.nextInt();
     }
     Arrays.sort(scores);//排序
     System.out.println("学员成绩按升序排序：");
     for (int i = 0; i < scores.length; i++) {
         System.out.println(scores [i]+" ");
     }

 public static void main(String[] args) {
     Scanner input=new Scanner(System.in);
     int scores []=new int[5];
     int max=0;
     System.out.println("请输入5位同学的成绩：");
     //录入成绩
     for (int i = 0; i < scores.length; i++) {
         scores[i]=input.nextInt();
     }

     for (int i = 0; i < scores.length; i++) {
         if (scores[i]>max) {
             max=scores[i];
         }
     }
         System.out.println("最高分："+max);
     }

 public static void main(String[] args) {
     Scanner input=new Scanner(System.in);
            int [] list=new int [6];
            list[0]=99;
            list[1]=95;
            list[2]=92;
            list[3]=89;
            list[4]=69;
            list[5]=49;
            int index=list.length;//保存新增成绩的位置
            System.out.println("请输入新增成绩：");
            int num=input.nextInt();//输入要插入的数据
            //找到新元素插入的位置
            for (int i = 0; i < list.length; i++) {

                if (num>list[i]) {
                 index=i;
                 break;
             }
         }
            //元素后移
            for (int i =list.length-1 ; i >index ; i--) {
         list[i]=list[i-1];//index下标开始的元素后移一个位置
         }
            list[index]=num;
     System.out.println("插入成绩的下标："+index);

     System.out.println("插入后成绩信息是：");
     for (int i = 0; i < list.length; i++) {
         System.out.println(list[i]+"\t");
     }
     }

 public static void main(String[] args) {
     Scanner input=new Scanner(System.in);
     String[]num=new String[]{"a","c","u","b","e","p","f","z"};
     System.out.print("原字符序列:");
     for (int i = 0; i < num.length; i++) {
         System.out.print(num[i]+" ");
     }
     Arrays.sort(num);
     System.out.println();//换行
     System.out.print("升序排序后:");
     for (int i = 0; i < num.length; i++) {
         System.out.print(num[i]+" ");
     }
     System.out.println();//换行
     System.out.print("逆序输出为:");
     //逆序，则从最后的哪一个元素排在第一位
     for (int i = num.length-1; i >=0 ; i--) {
         System.out.print(num[i]+" ");
     } 

 Scanner input=new Scanner(System.in);
     String[]num=new String[]{"a","c","u","b","e","p","f","z"};
     System.out.print("原字符序列:");
     for (int i = 0; i < num.length; i++) {
         System.out.print(num[i]+" ");
     }
     Arrays.sort(num);
     System.out.println();//换行
     System.out.print("升序排序后:");
     for (int i = 0; i < num.length; i++) {
         System.out.print(num[i]+" ");
     }
     System.out.println();//换行
     System.out.print("逆序输出为:");
     //逆序，则从最后的哪一个元素排在第一位
     for (int i = num.length-1; i >=0 ; i--) {
         System.out.print(num[i]+" ");
     }
   int index=num.length;//待插入的字符的位置
   System.out.println();
   System.out.print("待插入的字符:");
   String way=input.next();//输入要插入的位置
   //找到要插入字符的位置
   for (int i = 0; i < num.length; i++) {
     if (way.equalsIgnoreCase(num[i])) {
         index=i;
         break;
     }
 }
   //元素后移
   for (int i =num.length-1; i >index; i--) {
     num[i]=num[i-1];
 }
   num[index].equals(way);//插入数据
   System.out.println("插入字符的下标:"+index);
   System.out.println("插入后字符的信息是:");
   for (int i = 0; i < num.length; i++) {
     System.out.println(num[i]+"\t");
 }

 Scanner input=new Scanner(System.in);
      System.out.println("请输入4家店的价格");
        int[]num=new int[4];
        for (int i = 0; i < num.length; i++) {
                System.out.print("第"+(i+1)+"店的价格:");
                num[i]=input.nextInt();
            }
        int min=num[0];
         int index=0;
            for (int j = 0; j < num.length; j++) {
             if (num[j]<min) {
                 min=num[j];
                 index=j;
             }

            }
            System.out.print("最低价格:"+min);
            System.out.println("且它在数组中的原始位置(下标)是:" + index);
         }
     }

     }

     Scanner input=new Scanner(System.in);
        String []num= new String[5];
        System.out.println("请输入5句话");
        for (int i = 0; i < num.length; i++) {
         System.out.print("第"+(i+1)+"句话:");
         num[i]=input.next();
       }
        System.out.println();
        System.out.println("逆序输出的5句话:");
        for (int i =num.length-1; i>=0 ; i--) {
         System.out.print(num[i]+" ");
     }
 int[] points = { 18, 25, 7, 36, 13, 2, 89, 63 };
         System.out.println("8位顾客的积分:");
         for (int i = 0; i < points.length; i++) {
             System.out.print(points[i] + "\t");
         }
         System.out.println();
         int min = 0;
         int index = 0;
         min = points[0];
         for (int i = 1; i < points.length; i++) {
             if (points[i] < min) {
                 min = points[i];
                 index = i;
             }
         }
         System.out.println("其中最低积分:" + min);
         System.out.println("且它在数组中的原始位置(下标)是:" + index);
     }

 Scanner input=new Scanner(System.in);
         int nums[] = new int[10];
         int a = 0;
         int b = 0;
         int c = 0;
         int d = 0;
         System.out.println("请输入10个数:");
         for (int i = 0; i < nums.length; i++) {
             nums[i] = input.nextInt();

             switch (nums[i]) {
             case 1:
                 a++;
                 break;
             case 2:
                 b++;
                 break;
             case 3:
                 c++;
                 break;
             default:
                 d++;
                 break;
             }

         }
         System.out.println("数字1的个数:"+a);
         System.out.println("数字2的个数:"+b);
         System.out.println("数字3的个数:"+c);
         System.out.println("非法数字的个数:"+d);

 Scanner input=new Scanner(System.in);

     int []array=new int[]{1,3,-1,5,-2};
     System.out.println("原数组的为:");
     for (int i = 0; i < array.length; i++) {
         System.out.print(array[i]+ " ");
     }
     System.out.println();
       int newarray[]=new int[5];
       for (int i = array.length - 1; i >= 0; i--) {
             if (array[i] < 0) {
                 continue;
             }
             if (array[i] > 0) {
                 newarray[array.length - i - 1] = array[i];
             }
         }
         System.out.println("");
         System.out.println("逆序并处理后的数组为:");
         for (int i = 0; i < newarray.length; i++) {
             System.out.print(newarray[i]+" ");
         }
          }
 public static void main(String[] args) {
         Scanner input=new Scanner(System.in);
     int [] score=new int[4];
     int classNum=3;
     double Sum=0.0;//成绩总和
     double []average=new double[classNum];//平均成绩数组
     //循环输入学员成绩
     for (int i = 0; i <classNum; i++) {
         Sum=0.0;//成绩总和归零
         System.out.println("请输入第"+(i+1)+"个班的成绩");
         for (int j = 0; j < score.length; j++) {
             System.out.print("第"+(j+1)+"个学员的成绩:");
             score[j]=input.nextInt();
             Sum=Sum+score[j];
         }
         average[i]=Sum/score.length;//计算平均分
         System.out.println("第"+(i+1)+"个班级参赛学员的总成绩:"+Sum);
         System.out.print("第"+(i+1)+"个班级参赛学员的平均分是:"+average[i]+" \n");
     }

         }

 public static void main(String[] args) {
         Scanner input=new Scanner(System.in);    

         int [] score=new int[4];
         int classNum=3;
         double Sum=0.0;//成绩总和
         int count=0;//记录80分以上的人数
         double []average=new double[classNum];//平均成绩数组
         //循环输入学员成绩
         for (int i = 0; i <classNum; i++) {
             Sum=0.0;//成绩总和归零
             System.out.println("请输入第"+(i+1)+"个班的成绩");
             for (int j = 0; j < score.length; j++) {
                 System.out.print("第"+(j+1)+"个学员的成绩:");
                 score[j]=input.nextInt();
                 Sum=Sum+score[j];
                 if (score[j]<85) {//成绩小于85，则跳出本次循环
                     continue;
                 }
                 count++;
             }
             average[i]=Sum/score.length;//计算平均分
             System.out.println("第"+(i+1)+"个班级参赛学员的总成绩:"+Sum);
             System.out.print("第"+(i+1)+"个班级参赛学员的平均分是:"+average[i]+" \n");
             System.out.println("成绩85分以上的人数:"+count+"人");
         }

     Scanner input=new Scanner(System.in);
     System.out.println("请输入直角三角形的行数:");
     int Rownum=0;
     Rownum=input.nextInt();
     for (int i = 1; i <=Rownum; i++) {//行数
         for (int j = 1; j <=i*2-1; j++) {//星数
             System.out.print("☆");
         }
         System.out.println();
     }
         }
         Scanner input=new Scanner(System.in);
     System.out.println("请输入倒直角三角形的行数:");
     int Rownum=0;
     Rownum=input.nextInt();
     for (int i = 1; i <=Rownum; i++) {//行数
         for (int j = 1; j <=10-i; j++) {
             System.out.print("*");
         }
         System.out.println("");
     }

         }
     Scanner input=new Scanner(System.in);
     System.out.println("请输入等腰三角形的行数:");
     int Rownum=0;
     Rownum=input.nextInt();
     for (int i = 1; i <=Rownum; i++) {//行数
         for (int j = 0; j <Rownum-i; j++) {//空格数
             System.out.print(" ");
         }
         for (int k = 1; k <=2*i-1; k++) {//星星数
             System.out.print("*");
         }
         System.out.println("");

     }
 public static void main(String[] args) {
         Scanner input=new Scanner(System.in);
     int Rownum=9;
     for (int i = 1; i <=Rownum; i++) {//行数
         for (int j = 1; j <=i; j++) {//空格数
             System.out.print(j+"*"+i+"="+j*i+" ");
         }
         System.out.println("");

     }
 public static void main(String[] args) {
         Scanner input=new Scanner(System.in);
     int count=0;//计数器
     String choice="";//顾客选择是否离开
             for (int i = 0; i <5; i++) {
                 System.out.println("欢迎光临第"+(i+1)+"家专卖店");
             for (int j = 0; j <3; j++) {
                 System.out.println("要离开吗?(y/n)");
             choice=input.nextLine();
             //如果离开，则跳出，进入下一家店
             if ("y".equals(choice)) {
             break;
             }
             System.out.println("买了一件衣服");
             count++;
             }
             System.out.println("离店结账");
             }
             System.out.println("总共买了"+count+"件衣服");
             choice=input.nextLine();

     int way = 1;    //买法
         int k = 0;    //雏鸡数
         for(int i=1;i<=20;i++){        //公鸡数
             for(int j=1;j<=33;j++){    //母鸡数
                 k = 100-i-j;        //一共100只鸡
                 if(k%3 == 0 && (5*i+3*j+k/3 == 100)){//雏鸡数是3的倍数，总计100文钱
                     System.out.print("买法 " + way++ + ": ");
                     System.out.println("公鸡: " +i+ "    母鸡：" +j+ "     雏鸡：" +k);

                 }
             }
         }
     Scanner input=new Scanner(System.in);    

         int[] score = new int[4];//从零开始，0,1,2,3数    ，//成绩数组
                 int classnum = 3;                        //班级数目
                 double sum = 0.0;                        //成绩总和
                 double average = 0.0;                    //平均成绩
                 int count = 0;                            //记录85分以上学员人数

                 //循环输入学员成绩

                 for(int i = 0; i < classnum; i++){
                     System.out.println("请输入第" + (i+1) + "个班级的成绩");
                     for(int j = 0; j < score.length; j++){
                         System.out.print("请输入第" + (j+1) + "个学员的成绩：");
                         score[j] = input.nextInt();
                         if(score[j] < 85){    //成绩小于85，则跳出本轮循环
                             continue;
                         }
                         sum = sum + score[j];            //成绩85分以上才进行累加
                         count++;
                     }
                 }
                 average = sum / count;                    //所有成绩85分以上的学员的平均分
                 System.out.println("所有成绩85分以上的学员的平均分为：" + average);

 Scanner input=new Scanner(System.in);
         String pass = "";                //保存用户输入密码
         int amount = 0;                    //取款金额
         String password = "111111";        //用户密码
         int count = 0;                    //记录密码输入次数
         boolean isPass = false;            //密码是否通过验证
         while(count < 3 && !isPass){
             System.out.print("请输入密码：");
             pass = input.next();
             if(!password.equals(pass)){
                 count++;
                 continue;
             }
             isPass = true;                //密码通过验证
             System.out.print("请输入金额：");
             amount = input.nextInt();
             while(amount>0){
                 if(amount<=1000 && amount%100==0){
                     System.out.println("您取了" +amount+ "元");
                     System.out.println("交易完成，请取卡！");
                     break;                //完成交易，退出
                 }else{
                     System.out.print("您输入金额的金额不合法，请重新输入：");
                     amount = input.nextInt();
                     continue;            //继续让用户输入金额
                 }
             }
         }
         if(!isPass){                    //用户输入了3次错误密码
             System.out.print("密码错误，请取卡！");
         }
 Scanner input=new Scanner(System.in);
         int rows = 0;    //菱形的行数
         System.out.print("请输入菱形行数：");
         rows = input.nextInt();

         while(rows%2 == 0){
             System.out.print("请输入奇数：");
             rows = input.nextInt();
         }

         int n = (rows+1)/2;
         //打印菱形的上半部分
         for(int i = 1; i <= n; i++){//外层循环变量i控制行数
             for(int j = 1; j <= n-i; j++){//内层循环变量j控制该行空格数
                 System.out.print(" ");
             }
             for(int k = 1; k <= 2*i-1; k++){//内层循环变量k控制该行*号数
                 System.out.print("*");
             }
             System.out.print("\n");
         }
         //打印菱形的下半部分
         for(int i = n-1; i >= 1; i--){
             for(int j = 1; j <= n-i; j++){
                 System.out.print(" ");
             }
             for(int k = 1; k <= 2*i-1; k++){
                 System.out.print("*");
             }
             System.out.print("\n");
         }
     Scanner input = new Scanner(System.in);
         String answer = "";
         boolean a = false;
         boolean b = false;
         do {
             System.out.println("*********欢迎**********");
             System.out.println("1.注册");
             System.out.println("2.登录");
             System.out.println("3.抽奖");
             System.out.println("请输入:");
             int num = input.nextInt();
             switch (num) {
             case 1:
                 System.out.println("您选择的是注册");
                 System.out.println("请填写个人注册信息");
                 System.out.println("用户名:");
                 String name = input.next();
                 System.out.println("密码:");
                 int nums = input.nextInt();
                 int random = (int) (Math.random() * 9000) + 1000;
                 System.out.println("用户名\t密码\t会员号");
                 System.out.println(name + "\t" + nums + "\t" + random);
                 a = true;
                 System.out.println("是否继续(y/n)");
                 answer = input.next();
                 break;
             case 2:
                 if (a == true) {
                     System.out.println("您选择的是登录");
                     System.out.println("请输入您的用户名:");
                     name = input.next();
                     System.out.println("请输入密码:");
                     nums = input.nextInt();
                     System.out.println("欢迎您" + name);
                     b = true;
                 } else {
                     System.out.println("请您先注册,亲");
                 }
                 System.out.println("是否继续(y/n)");
                 answer = input.next();
                 break;
             case 3:
                 int random1 = (int) (Math.random() * 9000) + 1000;
                 if (b == true) {
                     System.out.println("您选择的是抽奖");
                     System.out.println("请输入您的卡号:");
                     int kahao = input.nextInt();
                     System.out.println("本日的幸运数字为");
                     for (int i = 0; i < 5; i++) {
                         random1 = (int) (Math.random() * 9000) + 1000;
                         System.out.print(random1+"\t");
                     }
                     if (kahao == random1) {
                         System.out.println("恭喜您,您中奖了");
                         System.out.println("是否继续(y/n)");
                         answer = input.next();

                     } else {
                         System.out.println("对不起!您不是本日的幸运会员.");
                         System.out.println("是否继续(y/n)");
                         answer = input.next();

                     }

                 } else {
                     System.out.println("请先登录,亲");
                     System.out.println("是否继续(y/n)");
                     answer = input.next();

                 }
                 break;
             default:
                 System.out.println("输入错误!");
                 System.out.println("是否继续(y/n)");
                 answer = input.next();
                 break;
             }

         } while (answer.equals("y"));
         System.out.println("退出");

 public class School {
     /*
      * School类的属性
      * */
 String schName;//名称
 int classNumber;//教室数目
 int labNumber;//机房数目
 /*
  * School类的Show方法
  * */
 public void Show(){
     System.out.println(schName+"培训中心\n"+"配备:"+
 classNumber+"教"+labNumber+"机");

     public static void main(String[] args) {
         School sch=new School();
         System.out.println("*******初始化成员变量前*******");
         sch.Show();
         sch.schName="北京";
         sch.classNumber=20;
         sch.labNumber=30;
         System.out.println("\n**********初始化变量后**************");
         sch.Show();

 public class Student {
 /*Student的属性
  * */
     String name;
     int age;
     String classNo;//班级
     String hobby;//爱好
     /*Student的方法
      * */
     public void showStudent(){
         System.out.println("姓名:"+name+"\n年龄:"+age+"\n就读于:"+classNo+"\n爱好:"+hobby);

     }
 }
 public static void main(String[] args) {
 Student stu=new Student();
         stu.name="小小";
         stu.age=15;
         stu.classNo="S1";
         stu.hobby="打篮球";
         stu.showStudent();

 public class Visitor {
 String name;
 int age;
 public void Show(){
     Scanner input=new Scanner(System.in);
     while (!"n".equals(name)) {
         if (age>=18&&age<=60) {
             System.out.println(name+"的年龄为:"+age+",门票价格为:20元\n");
         }else {
             System.out.println(name+"的年龄为:"+age+",门票免费\n");
         }
         System.out.println("请输入姓名:");
         name=input.next();
         if (!"n".equals(name)) {
             System.out.print("请输入年龄:");
         age=input.nextInt();//给age属性赋值
         }
     }
     System.out.println("退出程序");
    }

     public static void main(String[] args) {
         //************Visitor**********
         Scanner input=new Scanner(System.in);
         Visitor v=new Visitor();
         System.out.println("请输入姓名:");
         v.name=input.next();
         System.out.println("请输入年龄:");
         v.age=input.nextInt();
         v.Show();

 public class Administrator {
 public String name;
 public String password;

 }
 public class OneDay {
     public static void main(String[] args) {
         //************Visitor**********
         Scanner input=new Scanner(System.in);
     Administrator as=new     Administrator();
     as.name="admin";
     as.password="111111";
     //输入旧密码
      String chioce="";
 do {
         System.out.println("请输入用户名:");
         String nameinput=input.next();
         System.out.println("请输入密码");
         String pass=input.next();
         //判断用户输入的用户名是否正确
         if (as.name.equals(nameinput)&&as.password.equals(pass)) {
             System.out.println("\n请输入新密码:");
         as.password=input.next();
         System.out.println("修改密码成功！！您的新密码:"+pass);

         }else {
             System.out.println("用户名和密码不匹配，您没有权利更改信息");
             System.out.println("还想继续吗?请输入(y/n)");
             chioce=input.next();
         }
     }while("y".equals(chioce));

         }

     public class Calcutor {
     public int num1;
     public int num2;
     public String yunsuan;

 }
 Scanner input =new Scanner(System.in);
         Calcutor  calculator=new  Calcutor();
             System.out.println("请输入操作数");
              calculator.num1=input.nextInt();
              System.out.println("请输入运算符");
              calculator.yunsuan=input.next();
              char a=calculator.yunsuan.charAt(0);
              System.out.println("请输入操作数");
              calculator.num2=input.nextInt();
              switch(a){
              case '+':
                  System.out.println(calculator.num1+"+"+calculator.num2+"="+(calculator.num1+calculator.num2));
                  break;

 public class Currentlor {
     public String time;
     public void show(){

     }
     public String time2;
     public void show(){

     }
     public static void main(String[] args) {
         Scanner input =new Scanner(System.in);
         Currentlor currentTime=new Currentlor();
         currentTime.time="2015年5月12日10点11分00秒";
         System.out.println(currentTime.time);
         currentTime.show();
         System.out.println("改后为");
         Domo domo=new Domo();
         domo.time2="2015年5月12日10点11分30秒";
         System.out.println(domo.time2);
         domo.show();

 public class Season {
     String spring(){
         return "\n该季节为春季";
     }
     String summer (){
         return "\n该季节为夏季";
     }
     String autumn(){
         return "\n该季节为秋季";
     }
     String winter(){
         return "\n该季节冬季";
     }
 }     

     public static void main(String[] args) {
         // TODO Auto-generated method stub
         Season sn=new Season();
         //获取输入
         /* 接收成绩 */
         Scanner input = new Scanner(System.in);
         System.out.print("请输入月份：");
         int mon = input.nextInt();
         switch(mon){
             case 1:
             case 2:
             case 3:
                 System.out .println(sn.spring());
                 break;
             case 4:
             case 5:
             case 6:
                 System.out .println(sn.summer());
                 break;
             case 7:
             case 8:
             case 9:
                 System.out .println(sn.autumn());
                 break;
             case 10:
             case 11:
             case 12:
                 System.out .println(sn.winter());
                 break;
             default:
                     System.out .println("输入有误，请输入1~12月份数。");
                 break;

         }     

 public class GuessMachine {
     String name ;
        double price;

        /**
         * 初始化商品信息
         */
         public void initial(){
             int random = (int)(Math.random()*10);  //产生随机数
             switch(random){
               case 0:
               case 1:
               case 2:
               case 3:
                   name = "公主电动车";
                   price = 2000;
                   break;
               case 4:
               case 5:
               case 6:
                   name = "34寸纯平彩电";
                   price = 3000;
                   break;
               case 7:
               case 8:
               case 9:
                   name = "新飞冰箱";
                   price = 3400;
                   break;
               default:
                   break;
             }
         }   

         /**
          * 猜测
          */
         public void guess(){
             System.out.print("\n请猜测\""+ name + "\"的价格： " );
             Scanner input = new Scanner(System.in);
             double guessPrice = input.nextDouble();   //从键盘获取用户猜的价格;
             boolean isCorrect = false;
             for(int i = 0; i<3; i++){   //允许最多猜4次
                 if(guessPrice == price){   //判断是否猜对，并给出提示信息
                     System.out.println("猜对了！");
                     isCorrect = true;
                     break;
                 }else if(guessPrice > price){
                     System.out.println("再小点！");
                 }else{
                     System.out.println("再大点！");
                 }
                 System.out.print("\n再猜一次吧： ");
                 guessPrice = input.nextDouble();
             }
             if(!isCorrect){
                 System.out.println("\n4次内没有猜对，下次努力吧！");
             }}
 public static void main(String[] args) {
         GuessMachine gm = new GuessMachine();
         gm.initial();
         gm.guess();
     }

 public class Computer {
     public String nickName;
     public int fenshu;
     public int chuquan(){
         int num=(int)(Math.random()*3)+1;
         switch (num) {
         case 1:
             System.out.println("["+nickName+"]"+"您出的是剪刀");
             break;
         case 2:
             System.out.println("["+nickName+"]"+"您出的是石头");
             break;
         case 3:
             System.out.println("["+nickName+"]"+"您出的是布");
             break;
         default:
             break;
         }
         return num;
 }

 public class Judge {
     Computer computer = new Computer();
     Person person = new Person();
     int count = 0;
     String answer = "";

     public void result() {
         System.out.println("游戏结束了,比赛结果如下");
         System.out.println(person.nickName + "\tVS" + computer.nickName);
         System.out.println("我们一共玩了" + count + "局");
         System.out.println("其中我赢了" + person.fenshu + "局");
         if (person.fenshu > computer.fenshu) {
             System.out.println("我战胜了你");
         } else if (person.fenshu == computer.fenshu) {
             System.out.println("我们打了个平手");

         } else {
             System.out.println("我输了,其实我是让你的");
         }
     }

     public void getOnceResult() {
         Scanner input = new Scanner(System.in);
         System.out.println("您确定对战吗?(y/n)");
         answer = input.next();
         do {
             count++;
             int person1 = person.chuquan();
             int computer1 = computer.chuquan();
             if (person1 == 1 && computer1 == 2 || person1 == 2
                     && computer1 == 3 || person1 == 3 && computer1 == 1) {
                 System.out.println("不好意思,我赢了");
                 person.fenshu++;
             } else if (person1 == computer1) {
                 System.out.println("我们平局");
             } else {
                 System.out.println("我输了,你厉害");
                 computer.fenshu++;

             }
             System.out.println("继续吗?(y/n)");
             answer = input.next();
         } while (answer.equals("y"));
     }

     public void menuList() {
         System.out.println("------------------欢迎进入天尽头猜拳系统--------------");
         System.out.println("\n\t\t******************");
         System.out.println("\n\t\t*****游戏开始了 ******");
         System.out.println("\n\t\t*******************");
         System.out.println("出拳规则：1.剪刀  2.石头   3.布");
         System.out.println("请选择对方角色：1.上帝    2.耶稣     3.佛祖");
         Scanner input = new Scanner(System.in);
         int num = input.nextInt();
         System.out.println("请输入您的大名:");
         person.nickName = input.next();
         switch (num) {
         case 1:
             computer.nickName = "上帝";

             System.out.println(person.nickName + ",您选择与上帝对战");

             break;
         case 2:
             computer.nickName = "耶稣";
             System.out.println(person.nickName + ",您选择与耶稣对战");

             break;
         case 3:
             computer.nickName = "佛祖";
             System.out.println(person.nickName + ",您选择与佛祖对战");
             break;
         default:
             break;
         }
     }

     public void Welcome() {
         menuList();
         getOnceResult();
         // 出了循环,打印结果
         if (answer.equals("n")) {
             result();

         }
 public String nickName;
     public int fenshu;
     public int chuquan(){
         Scanner input=new Scanner(System.in);
         System.out.println("请出拳1.剪刀 2.石头 3.布 ");
         int num=input.nextInt();

         switch (num) {
         case 1:
             System.out.println(nickName+"您出的是剪刀");
             break;
         case 2:
             System.out.println(nickName+"您出的是石头");
             break;
         case 3:
             System.out.println(nickName+"您出的是布");
             break;
         default:
             break;
         }
         return num;
 }

 public static void main(String[] args) {
         Judge judge=new Judge();
         judge.Welcome();
     }

 public class Loan {

     /**
      * 计算月供
      * @return money
      */
     public double loan(double loan,int yearchoice){
         double money=0;

         if(yearchoice==1){
             money=(loan+loan*0.0603)/36;
         }else if(yearchoice==2){
             money=(loan+loan*0.0612)/60;
         }else{
             money=(loan+loan*0.0639)/240;
         }
         return money;
     }

 /**
      * @param args
      */
     public static void main(String[] args) {

         Loan  l= new Loan();
         Scanner input = new Scanner(System.in);
         System.out .print("请输入贷款金额：");
         double loan=input.nextDouble();
         System.out .print("请选择贷款年限：1.3年(36个月) 2.5年(60个月)  3.20年（240个月）：");
         int yc=input.nextInt();
         System.out.println("\n***月供为："+l.loan(loan, yc));
     }

 public class StudentBiz {
 /**
  * 求平均分
  * @param 一个学生
  */
 public double getAvg(Student stu){
     return stu.java+stu.c+stu.sql/3.0;
 }
 public class Student {
     public int java;
     public int c;
     public int sql;

 }
 import java.util.Scanner;
 public class Test {
 public static void main(String[] args) {
     Scanner input=new Scanner(System.in);
     //实例化学生对象
             Student student=new Student();
             System.out.println("请输入java的成绩");
             student.java=input.nextInt();
             System.out.println("请输入c的成绩：");
             student.c=input.nextInt();
             System.out.println("请输入sql的成绩:");
             student.sql=input.nextInt();

             StudentBiz sb=new StudentBiz();
             double avgScore=sb.getAvg(student);
             System.out.println("平均分："+avgScore);

 }
 }
 public class Triangle {
     /**
      * 三角形的判断
      * @param a、b、c边长
      * @return 是否是三角形
      */
     public boolean isTriangle(int a,int b,int c){
         boolean flag=false;
         if((a+b)>c &&(b+c)>a &&(a+c)>b){
             flag=true;
         }
         return flag;
     }
     /**
      * 三角形的形状判断
      * @param a、b、c边长
      * @return 何种三角形
      */
     public String Shape(int a,int b,int c){
         String shape="";        

         if((a==b)&&(b==c)&&(c==a)){
             shape="等边三角形";
         }else if((a==b)||(b==c)||(c==a)){
             shape="等腰三角形";
         }else {
             int A=a*a;
             int B=b*b;
             int C=c*c;
             if((A>B+C)||(B>A+C)||(C>A+B)){
                 shape="钝角三角形";
             }else if((A==B+C)||(B==A+C)||(C==A+B)){
                 shape="直角三角形";
             }else{
                 shape="锐角三角形";
             }
         }
         return shape;
     }

 public class TestTriangle {
 public static void main(String[] args) {

     Triangle t=new Triangle();
     boolean con=true;
     while(con){
         Scanner input = new Scanner(System.in);
         System.out .print("请输入第一条边：");
         int num1=input.nextInt();
         System.out .print("请输入第二条边：");
         int num2=input.nextInt();
         System.out .print("请输入第三条边：");
         int num3=input.nextInt();
         if(t.isTriangle(num1,num2,num3)){
             System.out .print("这是一个"+t.Shape(num1, num2, num3));
         }else{
             System.out .print("这不能构成三角形。");
         }
         System.out .print("\n继续吗？（y/n）:");
         String choice=input.next();
         if(choice.equals("n")){
             con=false;
             System.out .print("谢谢使用！");
         }
     }

 public class InputVerify {
 public static void main(String[] args) {
     Scanner input = new Scanner(System.in);
     boolean con = true;
     /*检验生日形式的有效性*/
     while(con){
        System.out.print("\n请输入会员生日<月/日：00/00>：  ");
        String day = input.next();
        if(day.indexOf('/')!=2){
            System.out.println("生日形式输入错误！");
        }else{
            System.out.println("该会员生日是： " + day);
            con = false;
        }
     }

     con = true;
     /*检验用户密码的有效性*/
     while(con){
        System.out.print("\n请输入会员密码<6~10位>：  ");
        String psw = input.next();
        if(psw.length() < 6 || psw.length() > 10){
             System.out.println("密码形式输入错误！");
        }else{
             System.out.println("该会员的密码是： " + psw);
             con = false;
        }
     }
 }
 public class StringExplorer {
     /**
      * 定位字符
      */
     public void locateChar(String full, char c) {
         System.out.print(c + "出现的位置是： ");
         for (int i = 0; i < full.length(); i++) {
             if (c == full.charAt(i)) {
                 System.out.print(i + "\t");
             }
         }
     }

     /**
      * 定位字符串
      */
     public void locateString(String full, String s) {
         int index = 0;
         int i = index;
         int length = full.length();
         System.out.print(s + "出现的位置是： ");
         do {
             index = full.indexOf(s, i);
             if (index == -1) {
                 break;
             }
             System.out.print(index + "   ");
             i = index + s.length();
         } while (i <= length);
     }
  */
     public static void main(String[] args) {
         // TODO Auto-generated method stub
         StringExplorer se = new StringExplorer();
         Scanner input = new Scanner(System.in);
         System.out.println("请输入一段字符： ");
         String full = input.next();
         System.out.println("请输入要查询的字符串： ");
         String s = input.next();
         se.locateString(full, s);
     }