package com.demo.aaa;
import java.util.Comparator;
public class demo2_内部类操作器 {
public static void main(String[] args) {
   TreeSet<String>() s = new TreeSet<>(new Comparator<String>(){
   public  int compare(String s1,String s2){
    int num = s2.length() - s1.length();
    return num ==0?s2.compareTo(s1):num;
   }
  });
  
}
}

TreeSet<String>() s  请问s前面加括号拿来干嘛?

TreeSet<String>() s 括号干嘛的 同问

路过,看看!!!