while循環不接受輸入後的代碼[Java]

Question

因此，在此程序中while循環結束時，它會正確顯示「You Win！」。它會執行代碼，詢問用戶是否想要查看積分。但是，在問題之後掃描儀/輸入未被接受，程序結束而沒有接受任何輸入。

Scanner scan = new Scanner(System.in); 

     System.out.println("Would you like to play a game called Threes? Y/N"); 
     String answer = scan.nextLine();  //Simple yes or no 

     if (answer.contains("Y") || (answer.contains("y"))) { 
      System.out.println("OK, want to know how it works? Y/N"); 
      String answer2 = scan.nextLine(); 
      if (answer2.contains("n") || (answer2.contains("N"))) { 
       System.out.println("OK, Enter a single number."); 

       int mistake = 0; //Used as a counter for number of division mistakes made 
       int numstart = scan.nextInt(); //First number input 
       int current = numstart;  //Current number displayed - starts as the first number 

       System.out.println("Enter 1 or -1 if you're adding or subtracting, and 0 to divide."); 
       System.out.println(numstart);  //Displays first number input 
       int input = scan.nextInt();  //First function performed by user 

       while (current != 1) {  //The game will run until the number '1' is reached 
        if (input == 1) {  //If '1' is input, add one to the number, and display new number 
         current++; 
         System.out.println(current); 
         input = scan.nextInt(); 
        } 
        if (input == -1) {  //If '-1' is input, subtract one from the number, and display new number 
         current--; 
         System.out.println(current); 
         input = scan.nextInt(); 
        } 
        if (input == 0) {  //If '0' is input, try to divide 
         if (current % 3 != 0 && current != 1) {  //If you can't divide by three, try again 
          System.out.println("Try again."); 
          mistake++; 
          input = scan.nextInt(); 
         } 
         if (current % 3 == 0) {  //If you can divide, do it and display new number 
          current = current/3; 
          System.out.println(current); 
          input = scan.nextInt(); 
         } 
        } 
        if (input == 69 || input == 666)  //Cheat code! If you input 69 or 666, you automatically win 
         break; 
        if (((input > 1) && (input != 69) && (input != 666)) || input < -1) {  //If input is not valid, try again and display error 
         System.out.println("Error - wrong input."); 
         input = scan.nextInt(); 
        } 
       } 
       System.out.println("You Win! Mistakes: " + mistake + "\n");  //Will display a win condition, and amount of division errors 
       System.out.println("Thank you for playing Threes \n - Chris Burbach"); 
      } 
      System.out.println("Credits? Y/N"); 
      String credits = scan.nextLine(); 

      if(credits.contains("Y")||credits.contains("y")) 
      { 
       System.out.println("\n***********************************************************************"); 
       System.out.println("*Threes: a game of dividing by three - inspired by my boredom in class*"); 
       System.out.println("***********************************************************************"); 
      } 
      else 
       System.out.println("OK, have a nice day."); 
      if (answer2.contains("Y") || answer2.contains("y")) { 
       System.out.println("OK, you first will enter a number, and then either enter '1' or '-1' to add or subtract 1 respectively. " + 
            "\nOr you can enter '0' to divide by three. The goal is to get your number down to '1' in as little steps as possible."); 
       System.out.println(" \nEnter a single number."); 

       int mistake = 0; //Used as a counter for number of division mistakes made 
       int numstart = scan.nextInt(); //First number input 
       int current = numstart;  //Current number displayed starts as the first number 

       System.out.println("Enter 1 or -1 if you're adding or subtracting, and 0 to divide."); 
       System.out.println(numstart);  //Displays first number input 
       int input = scan.nextInt();  //First function performed by user 

       while (current != 1) {  //The game will run until the number '1' is reached 
        if (input == 1) {  //If '1' is input, add one to the number, and display new number 
         current++; 
         System.out.println(current); 
         input = scan.nextInt(); 
        } 
        if (input == -1) {  //If '-1' is input, subtract one from the number, and display new number 
         current--; 
         System.out.println(current); 
         input = scan.nextInt(); 
        } 
        if (input == 0) {  //If '0' is input, try to divide 
         if (current % 3 != 0 && current != 1) {  //If you can't divide by three, try again 
          System.out.println("Try again."); 
          mistake++; 
          input = scan.nextInt(); 
         } 
         if (current % 3 == 0) {  //If you can divide, do it and display new number 
          current = current/3; 
          System.out.println(current); 
          input = scan.nextInt(); 
         } 
        } 
        if (input == 69 || input == 666)  //Cheat code! If you input 69 or 666, you automatically win 
         break; 
        if (((input > 1) && (input != 69) && (input != 666)) || input < -1) {  //If input is not valid, try again and display error 
         System.out.println("Error - wrong input."); 
         input = scan.nextInt(); 
        } 
       } 
       System.out.println("You Win! Mistakes: " + mistake + "\n");  //Will display a win condition, and amount of division errors 
       System.out.println("Thank you for playing Threes \n - Chris Burbach"); 
       System.out.println("\n***********************************************************************"); 
       System.out.println("*Threes: a game of dividing by three - inspired by my boredom in class*"); 
       System.out.println("***********************************************************************"); 
      } 
     } 
     if (answer.contains("N") || answer.contains("n")) 
      System.out.println("Okay, have a nice day."); 

Answer 1

對不起，我弄明白了。在每個「You Win！」實例之後，在其嵌套的if語句之外，我需要添加scan.nextLine();，因爲它會返回一個換行符並由於空輸入而終止程序。