java - 如何将 "\n"添加到字符串的最后一个单词？

Question

我想在字符串的最后一个单词前添加“\n”例如

你好 friend 123

这里我想在单词“123”之前添加“\n”

我尝试了下面的代码，但不知道现在该怎么办

String sentence  = "I am Mahesh 123"
String[] parts = sentence.split(" ");
String lastWord = "\n" + parts[parts.length - 1];

Answer 1

      Try this
            String sentence  = "Hello friends 123456";
            String[] parts = sentence.split(" ");
            parts[parts.length - 1] = "\n" + parts[parts.length - 1];

            StringBuilder builder = new StringBuilder();
            for (String part : parts) {
                builder.append(part);
                builder.append(" ");
            }

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

输出将是:~

 Hello friends

 123456