java - 如何循环直到用户在 Java 上输入正确？

Question

import java.util.Scanner;

public class SecretWord {
  public static void main( String[] args ) {

    Scanner input = new Scanner(System.in);
    String secret = "Please", guess;

    System.out.print( "Secret word?" );
    guess = input.next();

    for (int i = 0; guess.equals(secret); i++) {
      if( guess.equals(secret) ) {
        System.out.println("enter");
      } else {
        System.out.println( "try again" );
      }
    }
  }
}

如何才能做到当用户输入“请”以外的任何内容时，它会要求他/她重试？然后用户必须输入“Please”，结束循环，并打印“Enter”。

Answer 1

您必须将 input.next() 移动到循环内部，我建议使用 while 而不是 for循环:

public static void main(String[] args) {

    Scanner input = new Scanner(System.in);
    String secret = "Please", guess = "";

    System.out.print("Secret word?");

    while (!guess.equals(secret)) {
        guess = input.next();

        if (guess.equals(secret)) {
            System.out.println("enter");
        } else {
            System.out.println("try again");
        }
    }
}