java - “no”输入函数在 while 循环 Java 中不起作用

Question

• 该程序应验证用户输入。

• 游戏应该要求用户再次玩，如果是则继续，如果不是则停止。

• 一旦用户停止游戏，程序应该打印计算机和用户的总获胜次数。当我输入“no”时，它会打印“Type 1 for rock,...”而不是打印乐谱。下面是我的代码：

    import java.util.*;
    public class rockPaperScissors
    {
        public static void main(String[] args) 
        {
            Scanner input = new Scanner(System.in);
            System.out.println("Do you want to play a round of rock, paper, scissors? Type yes or no.");
        String YoN = input.nextLine();//yes or no repsonse
        int Uwin = 0;//user win count
        int Cwin = 0;//computer win count
        int tie = 0;//tie count
        if (YoN.equalsIgnoreCase("yes"))
        {
            while (!YoN.equalsIgnoreCase("no"))
            {
                System.out.println("Type 1 for rock, 2 for paper, and 3 for scissors.");
                Scanner console = new Scanner(System.in);
                int choice = console.nextInt();
                while (choice < 1 || choice > 3)
                {
                    System.out.println("Invalid entry. Please type 1, 2, or 3.");
                    choice = console.nextInt();
                }
                Random r = new Random();
                int comp = r.nextInt(3) + 1;
                if (comp == 1)
                {
                    System.out.println("Computer chose rock.");
                }
                if (comp == 2)
                {
                    System.out.println("Computer chose paper.");
                }
                 if (comp == 3)
                {
                    System.out.println("Computer chose scissors.");
                }
                if ((choice == 3 && comp == 1) || (choice == 2 && comp == 3) || (choice == 1 && comp == 2))
                {
                    Cwin++;
                }
                else if ((choice == 2 && comp == 1) || (choice == 3 && comp == 2) || (choice == 1 && comp == 3))
                {
                    Uwin++;
                }
                else
                {
                    tie++;
                }
                System.out.println("Computer wins: " + Cwin + "\nYour wins: " + Uwin + "\nTies: " + tie);
                System.out.println("\n\nDo you want to play a round of rock, paper, scissors?");
                YoN = console.nextLine();
                console.nextLine();
                if (YoN.equalsIgnoreCase("no"))
                {
                    System.out.println("Computer wins: " + Cwin + "\nYour wins: " + Uwin + "\nTies: " + tie);
                }
            }
        }
        else if (YoN.equalsIgnoreCase("no"))
        {
            System.out.println("Thank you!");
        }
        else
        {
            System.out.println("Invalid entry. Please type yes or no.");
            YoN = input.nextLine();
        }
    }
  

  }

标签： java

Answer 1

这行得通。我已将行更改YoN = console.nextLine();为YoN = input.nextLine();.

  import java.util.*;
  public class rockPaperScissors
  {
      public static void main(String[] args) 
      {
          Scanner input = new Scanner(System.in);
          System.out.println("Do you want to play a round of rock, paper, scissors? Type yes or no.");
      String YoN = input.nextLine();//yes or no repsonse
      int Uwin = 0;//user win count
      int Cwin = 0;//computer win count
      int tie = 0;//tie count
      if (YoN.equalsIgnoreCase("yes"))
      {
          while (!YoN.equalsIgnoreCase("no"))
          {
              System.out.println("Type 1 for rock, 2 for paper, and 3 for scissors.");
              Scanner console = new Scanner(System.in);
              int choice = console.nextInt();
              while (choice < 1 || choice > 3)
              {
                  System.out.println("Invalid entry. Please type 1, 2, or 3.");
                  choice = console.nextInt();
              }
              Random r = new Random();
              int comp = r.nextInt(3) + 1;
              if (comp == 1)
              {
                  System.out.println("Computer chose rock.");
              }
              if (comp == 2)
              {
                  System.out.println("Computer chose paper.");
              }
               if (comp == 3)
              {
                  System.out.println("Computer chose scissors.");
              }
              if ((choice == 3 && comp == 1) || (choice == 2 && comp == 3) || (choice == 1 && comp == 2))
              {
                  Cwin++;
              }
              else if ((choice == 2 && comp == 1) || (choice == 3 && comp == 2) || (choice == 1 && comp == 3))
              {
                  Uwin++;
              }
              else
              {
                  tie++;
              }
              System.out.println("Computer wins: " + Cwin + "\nYour wins: " + Uwin + "\nTies: " + tie);
              System.out.println("\n\nDo you want to play a round of rock, paper, scissors?");
              YoN = input.nextLine();
              //console.nextLine();
              if (YoN.equalsIgnoreCase("no"))
              {
                  System.out.println("Computer wins: " + Cwin + "\nYour wins: " + Uwin + "\nTies: " + tie);
              }
          }
      }
      else if (YoN.equalsIgnoreCase("no"))
      {
          System.out.println("Thank you!");
      }
      else
      {
          System.out.println("Invalid entry. Please type yes or no.");
          YoN = input.nextLine();
      }
  }
  }