java - 按字母顺序排列字符串和反转字符串？

Question

对于这个程序，我需要用户输入字符串，然后将其与相反的对应项一起放入数组中。然后整个数组将按字母顺序排列。所以它应该像这样工作:

• 输入:草莓香蕉、苹果、葡萄

• 输出:苹果、ananab、香蕉、elppa、葡萄、separg、草莓、yrrebwarts

我有这方面的代码，并且它在某种程度上有效。然而，它只按字母顺序排列反转和正常，但分开。所以它最终看起来像这样:

• 输出:ananab、elppa、separg、yrrebwarts、苹果、香蕉、葡萄、草莓

如您所见，它在某种程度上按字母顺序排列了单词，但不是应有的样子。这是我的代码:

import java.util.Scanner;

public class WordGame {

  public static void main(String[] args) { 
    String reverseInput = " "; //creates an empty string where the reverse will be stored before       putting it into the array
    String[] wordArray = new String[1000]; //creates an array that allows for 500 words, and 500     reverses of said words
    int s = 0;
    Scanner sc = new Scanner(System.in);
    System.out.println("Please enter the words you would like to reverse. To finish entering words enter a blank line:");
    String userInput = sc.nextLine(); //allows for user to input words

    int length = userInput.length();
    int i = 0;

    while (!userInput.equals("")){ //runs until the user enters a blank line
      reverseInput = " ";
      for(i = length - 1; i >= 0; i--)
        reverseInput += userInput.charAt(i); 
      wordArray[s] = userInput; //reverses user inputted strings by taking the last letter and putting it in front, repeating until the whole word is reversed
      wordArray[s + 1] = reverseInput; 
      s += 2;

      userInput = sc.nextLine();
      length = userInput.length();
    }

    for(int j = 0; j < s-1; j++){ //beginning of alphabetical sorting
      for(int k = 0; k < s-1-j; k++){
        int l = 0;
        while((int)wordArray[k].charAt(l) == (int)wordArray[k+1].charAt(l))
          l++;
        if ((int)wordArray[k].charAt(l) > (int)wordArray[k+1].charAt(l)){
          String holder = wordArray[k];
          wordArray[k] = wordArray[k+1];
          wordArray[k+1] = holder;
        }
      }

    }

        for(i = 0; i < wordArray.length; i++){
          if (wordArray[i]!= null){
            System.out.print(wordArray[i] + " "); //prints out contents of array
        }
        }
      }
    }

我不确定问题是什么。任何帮助将非常感激。谢谢!

Answer 1

据我所知，您在“reverseInput”前面添加了一个额外的空格 reverseInput = "";因为您的反向字符串不会以您认为的字符开头(它以空白开头)，所以结果不是您真正想要的。尝试删除空白并重试您的代码。