java - 剪刀石头布游戏 3 中最佳 2 循环问题

Question

如何让电脑在输入错误(除了选项之外的东西；石头、布、剪刀)时自动获胜？它也需要计算这些。另外，当玩家选择再次玩时，如何删除“欢迎...”再次出现；仅当程序首次启动时才需要。

import java.util.Scanner;
import java.util.Random;
/**
 * 
 * @author Chloe Harris
 *
 */
public class RockPaperScissorsGame {

    public static void main(String[] args) {
        // TODO code application logic here

        //Set integers for wins, losses, rounds, and user
        while(true){
            int wins = 0;
            int losses = 0;
            int round = 0;
            int Player = 0;

            //Plays 3 rounds before terminating
            //Prompt user to input Rock Paper Scissors
            System.out.print("Welcome to Rock Paper Scissors! Best 2 out of 3! \n");

            Scanner keyboard = new Scanner (System.in);
            while(round<3) {
                System.out.println("Enter \"Rock\", \"Paper\" or \"Scissors\"");
                Random Game = new Random();
                int Computer = 1+Game.nextInt(3);

                int Scissors, Rock, Paper;
                Rock = 1;
                Paper = 2;
                Scissors= 3;

                String UserInput =  keyboard.next();
                if(UserInput.equals("Rock"))  {
                    Player = 1;
                }
                if(UserInput.equals("Paper")) {
                    Player = 2;
                }
                if(UserInput.equals("Scissors")) {
                    Player = 3;
                }

                //If the user enters a value greater then 3 (Scissors) or less than 1 (Rock)
                //it will terminate the program and display an error message
                while (Player > 3 || Player < 1) {
                    losses++;
                    round++;
                    System.out.println("Not a valid input! Computer wins");
                    System.out.println("Player has won " + wins + " times and the computer has won " + losses + " times");

                }

                //Establish tie scenarios using if statements
                if(Player == Computer){
                    if(Player == Scissors){
                        System.out.println("Scissors v Scissors! Tie!");
                        round++;
                    }
                    if(Player == Rock){
                        System.out.println("Rock v Rock! Tie!");
                        round++;
                    }
                    if(Player == Paper){
                        System.out.println("Paper v Paper! Tie!");
                        round++;
                    }
                    System.out.println("Player has won " + wins + " times and the computer has won " + losses + " times");

                }

                //Establish the various winning scenarios using if and else if statements
                //Player wins
                if(Player == Scissors)
                    if(Computer == Paper){
                        System.out.println("Scissors v Paper! Player Wins!");
                        wins++;
                        round++;
                        System.out.println("Player has won " + wins + " times and the computer has won " + losses + " times");
                    }
                //Computer wins
                    else if(Computer == Rock){
                        System.out.println("Scissors v Rock! Computer Wins!");
                        losses++;
                        round++;
                        System.out.println("Player has won " + wins + " times and the computer has won " + losses + " times");
                    }
                //Player wins
                if(Player == Rock)
                    if(Computer == Scissors ){
                        System.out.println("Rock v Scissors! Player Wins!");
                        wins++;
                        round++;
                        System.out.println("Player has won " + wins + " times and the computer has won " + losses + " times");
                    }   
                //Computer wins
                    else if (Computer == Paper){
                        System.out.println("Rock v Paper! Computer Wins!");
                        losses++;
                        round++;
                        System.out.println("Player has won " + wins + " times and the computer has won " + losses + " times");
                    }
                //Player Wins
                if(Player == Paper)
                    if(Computer == Rock){
                        System.out.println("Paper v Rock! Player Wins!");
                        wins++;
                        round++;
                        System.out.println("Player has won " + wins + " times and the computer has won " + losses + " times");

                    }
                //Computer Wins 
                    else if (Computer == Scissors){
                        System.out.println("Paper v Scissors! Computer Wins!");
                        losses++;
                        round++;
                        System.out.println("Player has won " + wins + " times and the computer has won " + losses + " times");
                    }
            }

            //Determine final winner using if statements
            //Ask if player would like to play again by setting up string 
            if(wins>losses){
                System.out.println("The Player Wins!");
            }if(losses>wins){
                System.out.println("The Computer Wins!");
            }
            System.out.println("Play again? \"Yes\" or \"No\"");
            Scanner YesNo = new Scanner(System.in);

            String YesNo_String = YesNo.next();
            if(YesNo_String.equalsIgnoreCase("yes"))    {
            }if(YesNo_String.equalsIgnoreCase("No"))    {
                System.out.println ("Goodbye!");
            }
        }
    }
}

Answer 1

您始终可以将 if 语句更改为以下内容:

if(UserInput.equals("Rock"))  {
    Player = 1;
}
else if(UserInput.equals("Paper")) {
    Player = 2;
}
else if(UserInput.equals("Scissors")) {
    Player = 3;
}
else {
    Player = 0;
}

您已经将其设置为如果玩家 < 1，计算机将自动获胜。

注意:您的while (Player > 3 || Player < 1)语句实际上应该是 if陈述。否则，就会出现无限循环。

要回答你的第二个问题，只需移动语句 System.out.print("Welcome to Rock Paper Scissors! Best 2 out of 3! \n");在你的循环之上。这样它只会被询问一次:在开始时。