Question

我对我的代码有两个问题。

为什么输出＆＃34;哎呀请输入1到6之间的数字＆＃34;当我输入一个介于1和6之间的数字时。当我尝试更具体并制作一个else if语句时，当我输入一个不在1到6之间的数字时没有任何反应。
如何重新启动程序？在我的代码中，有一个if语句当用户输入＆＃34;再次播放时＃34;我的注释掉了 Mastermind.main()重新启动该计划，但这不起作用。

以下是代码：

import java.util.Scanner;

public class Mastermind {

    public static void main (String [] args) {
        // boolean variable to signal when the game is over.
        boolean done = false;

        // Scanner object
        Scanner scanner = new Scanner(System.in);

        // sets the value to twelve outside the loop so it doesn't set back each time.
        int guesses = 12;

       System.out.println("Please enter a number between 1-6 to begin (or \"quit\") to exit.");

        // while loop for the game
        while (!done) {

            //System.out.println("Please enter a number between 1-6  (or \"quit\") to exit the game:");

            // user input
            String input = scanner.nextLine();
            int number = 0; //Just initialized to some number


            // checks to see if the user wants to quit the game.
            if (input.equalsIgnoreCase("quit")) {
                System.out.println("Goodbye!");
                done = true;
                scanner.close();
            }

            else{

                try{
                    //Trying to see if the input was a number
                    number = Integer.parseInt(input);


                }
                catch(Exception e){
                    //The input wasn't an integer, it's invalid the starts loop again.
                    System.out.println("Invalid input.");
                    continue;
                }
            }

            // defines necessary int variables
            int random1 = (int) (Math.random() * 7);
            int random2 = (int) (Math.random() * 7);
            int random3 = (int) (Math.random() * 7);
            int random4 = (int) (Math.random() * 7);

           // If the user doesn't and decides to play, it runs this code.
            // checks to see if the user enters a number between 1-6
            if (number >= 1 && number <= 6) {

                if (number == random1) {
                    System.out.println("You guessed a correct number!");
                   guesses--;
                   System.out.println("guesses = " + guesses);

                }
                else if (number == random2) {
                    System.out.println("You guessed a correct number!");
                    guesses--;
                    System.out.println("guesses = " + guesses);


                }
                else if (number == random3) {
                    System.out.println("You guessed a correct number!");
                    guesses--;
                    System.out.println("guesses = " + guesses);
                }
                else if (number == random4) {
                    System.out.println("You guessed a correct number!");
                    guesses--;
                    System.out.println("guesses = " + guesses);

                }
                else {

                    System.out.println("Sorry that's not one of the numbers! Try again.");
                    guesses--;
                    System.out.println("guesses = " + guesses);
                }
            }


            if (guesses == 0){

                System.out.println("You've run out of guesses. To play again, enter \"play again\". Otherwise, enter or \"quit\")");
                if (input.equalsIgnoreCase("play again")){
                    // how do I restart the program?
                    //Mastermind.main(); // QUESTION 2
                }
                else if (input.equalsIgnoreCase("quit")){
                    System.out.println("Goodbye!");
                    done = true;
                    scanner.close();
                }
                else {
                    System.out.println("Goodbye!");
                    done = true;
                    scanner.close();
                }
            }
            else { //QUESTION 1

                System.out.println("Oops! Please choose a number between 1 and 6");
            }
        }
    }
}

Answer 1

每当guesses == 0评估为false时，您每次都会在循环中打印该消息。您可能只需要切换两个块的顺序。而不是：

if (number >= 1 && number <= 6) {
    ...
}
if (guesses == 0) {
    ...
}
else { //QUESTION 1
    System.out.println("Oops! Please choose a number between 1 and 6");
}

使用此：

if (number >= 1 && number <= 6) {
    ...
}
else { //QUESTION 1
    System.out.println("Oops! Please choose a number between 1 and 6");
}
if (guesses == 0) {
    ...
}

关于重新启动程序：如果我正确读取逻辑，您只需将done设置为false并将guesses重置为12。

另外两个逻辑点。首先，在检测到用户已输入continue后，您应该break或"quit"。其次，似乎你为每个用户猜测产生了四个新的随机整数。我不知道这是不是你想要的，但你可能想稍微改变逻辑。这也可能会影响重启逻辑。

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