获取HashSet的大小

 /* from 时代Java - N o w  J a v a . c o m*/

import java.util.HashSet;

 

public class Main {

 

  public static void main(String[] args) {

    HashSet hSet = new HashSet();

    System.out.println("Size of HashSet : " + hSet.size());

   

    //add elements to HashSet object

    hSet.add(new Integer("1"));

    hSet.add(new Integer("2"));

    hSet.add(new Integer("3"));

 

    System.out.println("Size of HashSet after addition : " + hSet.size());

   

    //remove one element from HashSet using remove method

    hSet.remove(new