Question

句子中的字符应该颠倒而不是单词

我尝试了以下代码

public class ReverseWords {

public static void main(String[] args) {

    ReverseWords obj = new ReverseWords();
    obj.reverseWordInMyString("It Costs 25000rs for 1 LCD Projector");
    obj.reverseWordInMyString("8990.33 ");
}
public void reverseWordInMyString(String str)
   {
    String[] words = str.split(" ");
    String reversedString = "";
    for (int i = 0; i < words.length; i++)
        {
           String word = words[i]; 
           String reverseWord = "";
           boolean numeric = true;
           try {
               Double num = Double.parseDouble(word);
           } catch (NumberFormatException e) {
               numeric = false;
           }
           if(!numeric) {
           for (int j = word.length()-1; j >= 0; j--) 
       {

        reverseWord = reverseWord + word.charAt(j);
       }
       reversedString = reversedString + reverseWord + " ";
        }
           else {
           reversedString = reversedString + word + " ";
           }
    }
    System.out.println(str);
    System.out.println(reversedString);
   }

}

我得到的输出是：tststC sr00052 rof 1 DCL rotcejorP

预期输出为：tI stsoC 25000sr rof 1 DCL rotcejorP

Answer 1

这应该做到。

      String str = "It Costs 25000rs for 1 LCD Projector";
      StringBuilder sb = new StringBuilder(str);
      Matcher m = Pattern.compile("([A-Za-z]+)").matcher(str);
      StringBuilder temp = new StringBuilder();
      while (m.find()) {
         String rev = temp.append(m.group(1)).reverse().toString();
         sb.replace(m.start(), m.end(), rev);
         temp.setLength(0);
      }
      String reversed = sb.toString();
      System.out.println(reversed);

Answer 2

npm install

Answer 3

我不喜欢这种解决方案，因为我总体上不喜欢while循环，但这似乎是逐个字符进行的最干净的方法（请告诉我如何进行改进）。它也应该是最有效的解决方案。我将问题理解为“应颠倒字母字符的顺序”。

public class ReverseWords {
  private static void reverse(char[] a, int left, int right) {
    right --;
    while (left < right) {
      char temp = a[left];
      a[left] = a[right];
      a[right] = temp;
      left++;
      right--;
    }
  }

  public static void main(String[] args) {
    char[] a = "It Costs 25000rs for 1 LCD Projector".toCharArray();
    int i = 0;
    while (i < a.length) {
      if (!Character.isAlphabetic(a[i])) {
        i++;
        continue;
      }
      int j = i + 1;
      while (j < a.length && Character.isAlphabetic(a[j])) {
        j++;
      }
      reverse(a, i, j);
      i = j;
    }
    System.out.println(new String(a));
  }
}

Answer 4

使用正则表达式如何？匹配[a-zA-Z]*[^(\d*)]之类的东西会隔离您的Alpha字符而不会与您的数字匹配。根据项目的要求，该语句可能需要稍作修改，但应该可以使您走上正确的轨道。

如何只反转句子中一个单词的字符（保留数字）？

4 个答案: