在用户在Java上进行正确输入之前，如何循环播放? [英] How do I loop until the user makes correct input on Java?

问题描述

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" );
      }
    }
  }
}

我如何做到这一点，以便当用户输入请"以外的任何内容时，它会要求他/她再试一次?然后，用户将必须输入"Please"，结束循环并打印"Enter".

How do I make it so that, when a user enters anything other than "Please", it will ask him/her to try again? Then the user will have to enter "Please", end the loop, and print "Enter".

推荐答案

使用while循环，

while (!guess.equals(secret)) {
    if( guess.equals(secret) ) {
        System.out.println( "enter" );
    } else {
        System.out.println( "try again" ); {
        System.out.println("Secret word")
        guess = input.next();
    }
}

除此之外，for循环具有以下语法，

Apart from this, the for loop have the following syntax,

for (before, conditionsIsTrue, end)

这意味着对您而言，循环将是这样，

This means that for you the loop will be like this,

for(int i=0; if(guess.equals(secret)), i++)

由于这种情况永远不会在第一个循环中成立，因此您根本不会进入for循环.

Since this condition will never hold for the first loop you will never enter the for loop at all.

您还可以使用使用后期测试的do-while，

You can also use do-while which uses a post test,

do {
    System.out.println("Secret word")
    guess = input.next();
    if( guess.equals(secret) ) {
        System.out.println( "enter" );
    } else {
        System.out.println( "try again" ); {
    }
} while (!guess.equals(secret));

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