查找HashSet的最大元素

 

import java.util.HashSet;/** 来 自 N o w J a v a . c o m - 时代Java**/

import java.util.Collections;

 

public class Main {

 

  public static void main(String[] args) {

   

    HashSet hashSet = new HashSet();

   

    hashSet.add(new Long("9"));

    hashSet.add(new Long("4"));

    hashSet.add(new Long("2"));

    hashSet.add(new Long("2"));

    hashSet.add(new Long("3"));