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Javaで、ユーザーが間違った入力をした場合、たとえば、以下に投稿したコードで尋ねた質問でプログラムを再起動するにはどうすればよいですか? Pick a number between 0-9 how do I have it restart at atユーザーが 10 以上または文字列などの間違った入力を入力した場合、その質問。ヒントや提案をいただければ幸いです。

import java.util.Scanner;

public class Project2 {

    public static void main(String[] args) {
        String PlayAgain = "Y";

        while (PlayAgain.equals("Y")) {
            // Generate a secret Numbers
            int number1 = (int) (Math.random() * 10);
            int number2 = (int) (Math.random() * 10);
            int number3 = (int) (Math.random() * 10);
            int arr[] = new int[3];
            arr[0] = number1;
            arr[1] = number2;
            arr[2] = number3;

            boolean g1;
            boolean g2;
            boolean g3;

            g1 = false;
            g2 = false;
            g3 = false;

            // Show secret numbers
            System.out.println(arr[0] + ", " + arr[1] + ", " + arr[2]);

            Scanner input = new Scanner(System.in);

            // Prompt the user to enter a guess

            System.out.print("Enter your lottery pick (0-9): ");
            int guess1 = input.nextInt();

            if (guess1 > 9) {
                System.out
                        .println("Wrong input enter only 1 number between 0-9: ");
            } else {

            }

            System.out.print("Enter your lottery pick (0-9): ");
            int guess2 = input.nextInt();

            if (guess2 > 9) {
                System.out
                        .println("Wrong input enter only 1 number between 0-9: ");
            } else {

            }

            System.out.print("Enter your lottery pick (0-9): ");
            int guess3 = input.nextInt();

            if (guess3 > 9) {
                System.out
                        .println("Wrong input enter only 1 number between 0-9: ");
            } else {
                continue;

            }

            // Show secret numbers and your numbers
            System.out.println("The Secret Numbers are " + arr[0] + (", ")
                    + arr[1] + (", ") + arr[2]);
            System.out.println("Your Numbers are " + guess1 + (", ") + guess2
                    + (", ") + guess3);

            if (guess1 == arr[0] && guess2 == arr[1] && guess3 == arr[2]) {
                System.out
                        .println("Three Matching in Exact order, You Won $100,000 ");
            } else if ((

            (guess1 == arr[1] || guess1 == arr[2])
                    && (guess2 == arr[0] || guess2 == arr[2]) && (guess3 == arr[0] || guess3 == arr[1]))

                    ||

                    ((guess1 == arr[0])
                            && (guess2 == arr[1] || guess2 == arr[2]) && (guess3 == arr[1] || guess3 == arr[2]))

                    ||

                    ((guess2 == arr[1])
                            && (guess3 == arr[0] || guess3 == arr[1]) && (guess1 == arr[0] || guess1 == arr[2]))

                    ||

                    ((guess3 == arr[2])
                            && (guess2 == arr[0] || guess2 == arr[2]) && (guess1 == arr[1] || guess1 == arr[0])))

            {
                System.out
                        .println("Three Matching in Different order, You Won $10,000 ");
            } else if (

            ((guess1 == arr[0] || guess1 == arr[1] || guess1 == arr[2]) && (guess2 == arr[0]
                    || guess2 == arr[1] || guess2 == arr[2]))
                    && (guess3 != arr[0] || guess3 != arr[1] || guess3 != arr[2])

                    ||

                    ((guess1 == arr[0] || guess1 == arr[1] || guess1 == arr[2]) && (guess3 == arr[0]
                            || guess3 == arr[1] || guess3 == arr[2]))
                    && (guess2 != arr[0] || guess2 != arr[1] || guess2 != arr[2])

                    ||

                    ((guess2 == arr[0] || guess2 == arr[1] || guess2 == arr[2]) && (guess3 == arr[0]
                            || guess3 == arr[1] || guess3 == arr[2]))
                    && (guess1 != arr[0] || guess1 != arr[1] || guess1 != arr[2])

            ) {
                System.out.println("Any Two Numbers Matching, You Win $1,000 ");
            } else if ((guess1 == arr[0] || guess1 == arr[1] || guess1 == arr[2])
                    && (guess2 != arr[0] || guess2 != arr[1] || guess2 != arr[2])
                    && (guess3 != arr[0] || guess3 != arr[1] || guess3 != arr[2])

                    ||

                    (guess2 == arr[0] || guess2 == arr[1] || guess2 == arr[2])
                    && (guess1 != arr[0] || guess1 != arr[1] || guess1 != arr[2])
                    && (guess3 != arr[0] || guess3 != arr[1] || guess3 != arr[2])

                    ||

                    (guess3 == arr[0] || guess3 == arr[1] || guess3 == arr[2])
                    && (guess1 != arr[0] || guess1 != arr[1] || guess1 != arr[2])
                    && (guess2 != arr[0] || guess2 != arr[1] || guess2 != arr[2])

            )// close if
            {
                System.out.println("Any One Number Matching, You Win $10 ");
            } else {
                System.out.println("You Lose Sorry ");
            }

            System.out.println("Would you like to play again? Y/N ");
            PlayAgain = input.next();
            PlayAgain = PlayAgain.toUpperCase();

        }// end of while loop
    } // end of main

} // end of class

コードが読みにくい場合は申し訳ありませんが、このような初心者であり、投稿する前に ctrl + shift + f を使用してコードをフォーマットしました。

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2 に答える 2

3

コードの再利用を処理するには、一部のロジックを個別のメソッドに分割することをお勧めします。ただし、表示されている内容と一致させ、例を読みやすくするために、数値を入力する場所でできることは次のとおりです。

        boolean isValid = false;
        while (!isValid) {
            System.out.print("Enter your lottery pick (0-9): ");

            int guess1 = -1;
            try {
                guess1 = input.nextInt();
            } catch (Exception e) {
                // Read any pending input which would be invalid characters at this point
                input.next();
            }

            if (guess1 > 9 || guess1 < 0) {
                System.out.println("Wrong input enter only 1 number between 0-9: ");
            } else {
                isValid = true;
            }
        }
于 2012-12-08T03:22:54.373 に答える
0

あなたのコードは「エレガント」ではありません。次のようなパターンを使用してみてください。

疑似 Java コード:

while (true) {
    // get input
    if (input is "exit")
        break;
    if (input is bad)
        continue;
    // process input
}
于 2012-12-08T03:24:05.733 に答える