weixin_45650737的博客

public static void main(String[] args) {StringJoiner stringJoiner = new StringJoiner(",");stringJoiner.add(“hello”);stringJoiner.add(“world”);stringJoiner.add(“hhh”);System.out.println(stringJoiner.toString());}输出：hello,world,hhh...

忽略大小写替换String aac = "123,nacn,345";String aa = aac.replaceAll("(?i)NacN", "0");