Question

代码应该反转一个字符串所以如果我输入“你好，你怎么样”它应该返回“你是多么喜欢”，并且这些单词按照正确的顺序出现，但它们也出现了反转的字样（例如“ouy era woh ih”）有没有人看到我应该添加或取出的内容？

import java.util.*;
public 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);
        }
    }

Answer 1

您需要将字符串分解为如下字样：

splitArray = original.split("\\s+");

或者有更多细节：

public 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();

        String[] splitArray;
        try {
            splitArray = original.split("\\s+");
            for (int i = splitArray.length - 1; i >= 0; i--) {
                reverse = reverse + splitArray[i] + " ";
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }

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

输出：

run:
Enter a string to reverse
this is a test
Reverse of entered string is: test a is this

Answer 2

最简单的方法是以相反的顺序拆分和访问数组：

String str = "hi how are you";

String[] words = str.split(" ");

StringBuilder buffer = new StringBuilder();
for (int i = words.length - 1; i >= 0; i--) {

     if(i != ( words.length - 1)) buffer.append(" ");

     buffer.append(words[i]);

     System.out.println(words[i]);
}

Answer 3

在str：

中反转的单词顺序

String [] parts = str.split (" ");
StringBuilder sb = new StringBuilder ();
for (int i = parts.length - 1; i >= 0; i--)
{
    if (sb.length () > 0) sb.append (' ');
    sb.append (parts [i]);
}
str = sb.toString ();

我的代码正在做我希望它做的一半。请帮忙

3 个答案: