java - while 循环中第一个循环后的输出

Question

我的问题不是关于一般游戏算法。当我对问题“您想继续吗？输入 true 或 false。”回答“true”时，程序输出:

"Player one, throw your shape(rock, paper, scissors)! 
 Player two, throw your shape(rock, paper, scissors)!"  

所以我可以在第一个周期输入值，但不能在第二个周期输入值。我该如何修复它？谢谢。

代码:

public static void main(String[] args) {

        String playerOne;
        String playerTwo;
        Scanner myScan = new Scanner(System.in);
        boolean playAgain = true;

        do 
        {
            System.out.println("Player one, throw your shape(rock, paper, scissors)! ");
            playerOne = myScan.nextLine();        
            System.out.println("Player two, throw your shape(rock, paper, scissors)! ");
            playerTwo = myScan.nextLine();




            if (playerOne.equals("scissors") && playerTwo.equals("rock"))
            {
            System.out.println("Player one lost! Playr two won!");
            } 

              else if (playerOne.equals("scissors") && playerTwo.equals("paper")) 
              {
              System.out.println("Player one won! Player two lost!");
              } 


              else if (playerOne.equals("rock") && playerTwo.equals("paper")) 
              {
               System.out.println("Player one lost! Player two won!");
              }


              else if (playerOne.equals("rock") && playerTwo.equals("scissors")) 
              {
              System.out.println("Player one won! Player two lost!");
              }


              else if (playerOne.equals("paper") && playerTwo.equals("scissors")) 
              {
              System.out.println("Player one lost! Player two won!");
              }


              else if (playerOne.equals("paper") && playerTwo.equals("rock")) 
              {
              System.out.println("Player one won! Player two lost!");
              }

              System.out.println("Do you want to continue? Enter true or false.");
              playAgain = myScan.nextBoolean();

        }while(playAgain);


    }
} 

Answer 1

这是因为 Scanner 仅读取您使用 nextBoolean 请求的 boolean 值，而不读取其他内容，甚至不读取以下行结尾。然后，结束行保留在输入流中，并在循环出现并且您请求 nextLine 时作为空行返回。

您需要做的是读取完整的一行，而不仅仅是 playAgain 的 boolean 值，并手动解释它(建议使用 myScan.nextLine() 之类的东西。等于("is"))。