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。