循环后如何将这个单词构建成一个句子？答案

【问题标题】：How do I build this words to one sentence after looping?循环后如何将这个单词构建成一个句子？
【发布时间】：2019-10-31 14:21:37
【问题描述】：

Am Looping through a sentence split it to capitalize.But it's hard to build it back after getting the individual words.

String str = "Not the answer you're looking for.";
     StringBuilder stringBuilder = new StringBuilder();
 String oneWord =" ";
    for (String word : str.toLowerCase().split(" ")){
        char firstLetter = word.substring(0,1).toUpperCase().charAt(0);
       oneWord  = firstLetter + word.substring(1);

        System.out.println(stringBuilder.append(oneWord + " "));

    }

}

我希望只得到一个完全构建的字符串“不是您正在寻找的答案。”

【问题讨论】：

请提供您得到的错误结果
希望对您有所帮助，stackoverflow.com/questions/3904579/…
char firstLetter = word.substring(0,1).toUpperCase().charAt(0); 恕我直言，char firstLetter = Character.toUpperCase(word.charAt(0)); 更具可读性

标签： java string loops

【解决方案1】：

  String str = "Not the answer you're looking for.";
  StringBuilder stringBuilder = new StringBuilder();
  String oneWord =" ";
  for (String word : str.toLowerCase().split(" ")){
    char firstLetter = word.substring(0,1).toUpperCase().charAt(0);
    oneWord  = firstLetter + word.substring(1);
    stringBuilder.append(oneWord + " ");
  }
  System.out.println(stringBuilder.toString());

您不会只得到一个字符串，因为您在 for 循环中使用了 System.out.println。

考虑我上面的例子

【讨论】：

【解决方案2】：

oneWord += firstLetter + word.substring(1) + " ";

循环后

oneWord = oneWord.trim();
System.out.println(oneWord);

所以解决办法是：

  String str = "Not the answer you're looking for.";
  StringBuilder sb = new StringBuilder();
  for (String word : str.toLowerCase().split(" ")) {
    sb.append(str.substring(0, 1).toUpperCase()); 
    sb.append(str.substring(1));
    sb.append(" ");
  }
  System.out.println(stringBuilder.toString().trim());

您的解决方案也不是最佳的。检查 String.join() 或像这样使用 somth

Arrays.stream(str.toLowerCase().split(" "))
   .map(word -> str.substring(0, 1).toUpperCase() + str.substring(1))
   .collect(Collectors.joining(" "));

【讨论】：