Java Data Type - 如何使用StringJoiner连接字符串

import java.util.StringJoiner;

public class Main {
  public static void main(String[] argv) {
    StringJoiner sj = new StringJoiner(":", "[", "]");
    sj.add("George").add("Sally").add("Fred");
    String desiredString = sj.toString();
    
    System.out.println(desiredString);
  }
}