字符串处理总结

StringJoiner

public static void main(String[] args) {
    //值依次是分割符,前缀,后缀
    StringJoiner joiner = new StringJoiner(",","[","]");
    joiner.add("张三").add("李四");
    //结果：[张三,李四]
    System.out.println(joiner);
}