java - 在 Java 中按单词将字符串换行在多个字符之后

Question

我有这个代码:

    String s = "A very long string containing " +
                   "many many words and characters. " +
                   "Newlines will be entered at spaces.";

    StringBuilder sb = new StringBuilder(s);

    int i = 0;
    while ((i = sb.indexOf(" ", i + 20)) != -1) {
        sb.replace(i, i + 1, "\n");
    }

    System.out.println(sb.toString());

代码的输出是:

A very long string containing
many many words and
characters. Newlines
will be entered at spaces.

上面的代码是在每 30 个字符的下一个空格之后换行字符串，但我需要在每 30 个字符的前一个空格之后换行字符串，就像第一行一样:

很长的字符串

第二行是

containing many

请给出一些正确的解决方案。

Answer 1

您可以使用Apache-common's WordUtils.wrap() .