反串印刷法

问题描述

我正在尝试解决以下问题，但是如何编写接受 String 作为参数的方法?

I am trying to solve the following problem but how do write the method that accepts String as an argument?

编写一个名为 printReverse 的方法，它接受一个 String 作为参数并以相反的顺序打印字符.如果空string 作为参数传递，该方法不应产生任何输出.一定要写一个 main 方法来令人信服地展示你的行动计划.不要使用相反的方法StringBuilder 或 StringBuffer 类！

到目前为止，我已经以更简单的方式解决了这个问题:

So far I have solved it in a easier manner:

import java.util.Scanner;

class ReverseString {
    public static void main(String args[]) {
        String original, reverse = "";
        Scanner in = new Scanner(System.in);

        System.out.println("Enter a string to reverse");
        original = in.nextLine();

        int length = original.length();

        for (int i = length - 1; i >= 0; i--)
            reverse = reverse + original.charAt(i);

        System.out.println("Reverse of entered string is: " + reverse);
    }
}

推荐答案

我强烈建议您阅读 基础教程.

你可以简单地:

private static String myReverse(String str) {
    String reverse = "";
    int length = str.length();
    for( int i = length - 1 ; i >= 0 ; i-- ) {
       reverse = reverse + str.charAt(i);
    }
    return reverse;
}

在您的 main 中，您只需:

And in your main, you simply:

String reversed = myReverse(in.nextLine());

请注意，方法是static，因为您是从静态方式(main 方法).如果您不希望它成为静态，则必须通过对象来访问它.

Note that the method is static because you're referring to it from a static manner (main method). If you don't want it to be static, you'll have to access it via an object.

另请注意，始终为 for 循环使用大括号是一种很好的做法，即使它包含一行也是如此.

Also note that it's a good practice to always have curly brackets for for loops, even if it contains a single line.

这篇关于反串印刷法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！