使用 do-while 循环的密码检查器

Question

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，直到最后输入单词“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，请使用 do-while 语句。

例子

输入单词：mart

第一个字符不等于最后一个字符：mart

输入一个单词：tart

第一个字符等于最后一个字符：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))

    } 

}

Answer 1

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。