java - Do-While 循环错误 - 不重复玩游戏

Question

我面临一个问题，如果用户想再次玩游戏，它不会提示用户输入数字，而是会打印出语句，我想知道为什么要这样做......如果用户输入“否”并且游戏将结束，它就可以正常工作。我将提供一张图片，以便您可以更好地了解我的问题所在。

 import java.util.Scanner; 
import java.util.*;
public class Moropinzee
{

  public static void main(String[] args) {

      int Monkey = 1;
      int Robot = 2;
      int Pirate = 3;
      int Ninja = 4;
      int Zombie = 5;
      int player1 = 0;
      int player2 = 0;
      String answer;     

      Scanner scan = new Scanner(System.in);  

      System.out.print("Hey, let's play Moropinzee!\n" + 
              "Please enter a move.\n"); 

      do{              
         System.out.println("Player 1: Enter a number 1-5 for Monkey, Robot, Pirate, Ninja, or Zombie:");   

         while(!(player1>0) || !(player1<6))    
         {       
             player1 = scan.nextInt();       
             if(player1>=6)
                System.out.println("Invalid choice, Player 1. Enter a number 1-5:");              
         }  


         Scanner keyboard = new Scanner(System.in); 
         System.out.println("Player 2: Enter a number 1-5 for Monkey, Robot, Pirate, Ninja, or Zombie:");

         while(!(player2>0) || !(player2<6))
         {       
             player2 = scan.nextInt();       
             if(player2>=6)
             System.out.println("Invalid choice, Player 2. Enter a number 1-5:");              
         }  


         if(player1==(player2)){
            System.out.println("Nobody wins!");    
         }
         else if (player1==(1)){
            if (player2==(4)){
               System.out.println("Monkey fools Ninja! Player 1 Wins!"); 
            }      
         }

         else if (player2==(1)){
            if (player1==(4)){
               System.out.println("Monkey fools Ninja! Player 2 Wins! "); 
            }
         }         
         if (player1==(1)){
            if (player2==(2))
                System.out.println("Monkey unplugs Robot! Player 1 Wins!");
         }
         if (player2==(1)){
            if (player1==(2))
                System.out.println("Monkey unplugs Robot! Player 2 Wins!");
         }      
         if (player1==(2)){
            if (player2==(4))
                System.out.println("Robot chokes Ninja! Player 1 Wins!");
         }         
         if (player1==(4)){
            if (player2==(2))
                System.out.println("Robot chokes Ninja! Player 2 Wins!");
         }        
         if (player1==(2)){
            if (player2==(5))
                System.out.println("Robot crushes Zombie! Player 1 Wins!");
         }
         if (player1==(5)){
            if (player2==(2))
                System.out.println("Robot crushes Zombie! Player 2 Wins!");
         }
         if (player1==(3)){
            if (player2==(2))
                System.out.println("Pirate drowns Robot! Player 1 Wins!");
         }
         if (player1==(2)){
             if (player2==(3))
                  System.out.println("Pirate drowns Robot! Player 2 Wins!");
         }
         if (player1==(3)){
             if (player2==(1))
                  System.out.println("Pirate skewers Monkey! Player 1 Wins!");
         }
         if (player1==(1)){
             if (player2==(3))
                 System.out.println("Pirate skewers Monkey! Player 2 Wins!");
         }
         if (player1==(4)){
             if (player2==(3))
                 System.out.println("Ninja karate chops Pirate! Player 1 Wins!");
         }
         if (player1==(3)){
             if (player2==(4))
                 System.out.println("Ninja karate chops Pirate! Player 2 Wins!");
         }
         if (player1==(4)){
             if (player2==(5))
                 System.out.println("Ninja decapitates Zombie! Player 1 Wins!");
         }
         if (player1==(5)){
             if (player2==(4))
                 System.out.println("Ninja decapitates Zombie! Player 2 Wins!");
         }
         if (player1==(5)){
             if (player2==(3))
                 System.out.println("Zombie eats Pirate! Player 1 Wins!");
         }
         if (player1==(3)){
             if (player2==(5))
                 System.out.println("Zombie eats Pirate! Player 2 Wins!");
         }
         if (player1==(5)){
             if (player2==(1))
                 System.out.println("Zombie savages Monkey! Player 1 Wins!");
         }
         if (player1==(1)){
             if (player2==(5))
                 System.out.println("Zombie savages Monkey! Player 2 Wins!");
         }

         System.out.println("Do you want to play again? Yes or No");
         answer = keyboard.next();
     }
     while(answer.equalsIgnoreCase("Yes"));
  }
}

/image/64H22.png

Answer 1

问题是您在第一次迭代后从未重置变量。在循环中，如果 player1 和 player2 变量不在有效范围内(它们将在以下迭代中出现)，则仅修改它们。因此，只要它继续运行，每次迭代都将与第一次相同。尝试将代码更改为:

player1 = 0;
player2 = 0;
System.out.println("Do you want to play again? Yes or No");
answer = keyboard.next();