Question

我已经对Java感兴趣了大约2个月，因为我已经在线完成了一些课程，我正在尝试为Rock Paper Scissors创建一个游戏。我希望游戏能够使用public static void toastAnywhere(final String text) { Handler handler = new Handler(Looper.getMainLooper()); handler.post(new Runnable() { public void run() { Toast.makeText(SuperApplication.getInstance().getApplicationContext(), text, Toast.LENGTH_LONG).show(); } }); }循环运行5次，尽管我在循环时遇到问题;它一直宣称赢家而不是重复游戏？

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Answer 1

您的switch语句超出了循环执行的代码，将其移动到行player2Input = userInput2.charAt(0);后面的点，它必须保留在循环括号内。

Answer 2

switch语句超出范围，这意味着程序不知道在哪里查找它，并且对于所有意图和目的，它对程序和循环是不可见的。如果将for循环后的括号移到switch语句之后，它应该运行得很好。

Answer 3

您编写的switch语句仅评估播放器的最后一个输入，因此需要在for循环中移动。

此外，在声明变量时初始化变量总是好的。

import java.util.Scanner;
public class Part2
{
    public static void main (String[]args)
    {
        Scanner scan = new Scanner(System.in);

        String userInput1 = "";
        char player1Input = ' ';

        String userInput2 = "";
        char player2Input = ' ';

        for(int i = 0; i < 5; i++) //Loop for game
        {
            System.out.println("Player 1: Please Enter e.g R for Rock:");
            System.out.println("R.Rock");
            System.out.println("P.Paper");
            System.out.println("S.Scissors");

            userInput1 = scan.next();
            player1Input = userInput1.charAt(0);


            System.out.println("Player 2: Please Enter e.g S for Scissors");
            System.out.println("R.Rock");
            System.out.println("P.Paper");
            System.out.println("S.Scissors");



            userInput2 = scan.next();
            player2Input = userInput2.charAt(0);

            switch(player1Input)
            {
                case 'R':  System.out.println ("Player 1:Rock");
                    switch(player2Input)
                    {
                        case'R' :
                            System.out.println("Player 2:Rock");
                            System.out.println("The Game Result is Draw");
                            break;
                        case'P' :
                            System.out.println("Player 2:Paper");
                            System.out.println("The Game Result is: Player 2 Wins");
                            break;
                        case'S' :
                            System.out.println("Player 2:Scissors");
                            System.out.println("The Game Result is: Player 1 Wins");
                            break;
                        default:
                            System.out.println("Invalid Option");
                            break;
                    }
                    break;

            case 'P' : System.out.println ("Player 1:Paper");
                switch(player2Input)
                {
                    case'R' :
                        System.out.println("Player 2:Rock");
                        System.out.println("The game result is: Player 1 Wins");
                        break;
                    case'P' :
                        System.out.println("Player 2:Paper");
                        System.out.println("The game result is: Draw");
                        break;
                    case'S' :
                        System.out.println("Player 2:Scissors");
                        System.out.println("The Game Result is: Player 2 Wins2");
                        break;
                    default:
                        System.out.println("Invalid Option");
                        break;
                }
                break;

            case 'S' : 
                System.out.println ("Player 1:Scissors");
                switch(player2Input)
                {
                    case'R' :
                        System.out.println("Player 2:Rock");
                        System.out.println("The Game Result is: Player 2 Wins");
                        break;
                    case'P' :
                        System.out.println("Player 2:Paper");
                        System.out.println("The game result is: Player 1 Wins");
                        break;
                    case'S' :
                        System.out.println("Player 2:Scissors");
                        System.out.println ("The Game Result is: Draw");
                        break;
                    default:
                        System.out.println("Invalid Option");
                        break;
                }
                break;
            }
        }
    }
}

使用for循环的岩石纸剪刀游戏Java

3 个答案: