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java - 使用 do-while 循环的密码检查器

问题描述

我朋友在我们的编程活动中提出的问题是

编写一段代码，从键盘读取单词，直到输入单词“cherry”或“CHERRY”。对于除 done 之外的每个单词，报告其第一个字符是否等于其最后一个字符。对于所需的循环，使用 do-while 语句。

例子

输入一个单词：mart
第一个字符不等于它的最后一个字符：mart

输入一个单词：tart
第一个字符等于它的最后一个字符：tart

输入一个词：cherry
程序正在终止...

package liniper;
import java.util.Scanner;

public class Liniper {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String pass = "cherry";

        do{
            System.out.println("Enter a word: ");
            pass = in.nextLine();
        } while("cherry".equal(pass))
    } 
}

标签： javaloopspasswordsdo-while

解决方案

你可以这样做：

public static void main(String[] args) {

    final String pass = "cherry"; // Defining the pass variable
    String word; // Defining the word variable
    boolean running = true; // Defining the running variable

    Scanner scanner = new Scanner(System.in); // Making new Scanner Instance

    do {
        System.out.print("Enter a word: "); // Informing the User to enter a word
        word = scanner.nextLine(); // Retrieving the Word from Input

        char first = word.charAt(0); // Get the first character of the word by using the #charAt(int) method
        char last = word.charAt(word.length() - 1); // Get the second character by looking at the total length of the word and subtracting 1

        // Make the word lowercase and see if it matches the "pass" variable we defined
        if (word.toLowerCase().equals(pass)) {
            running = false; // Stop the loop
            System.out.println("The program is now terminating..."); // Informing the user that the program stops

            // Checking if the first character equals the last
        } else if (first == last) {
            // Informing the user that the first character is equal to the last last character
            System.out.println("The first character is equal to it's last character:" + word);
        } else {
            // Informing the user that the first character is not equal to the last last character
            System.out.println("The first character is not equal to it's last character:" + word);
        }
    } while (running);
}

我希望这可以帮助你。

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