当集合里存储的是URL时的一些问题总结

package com.lk.C;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashSet;
import java.util.Set;

public class Test3 {
    private static final String [] URLNAMES = {
        "http://www.sina.com",//202.108.33.94
        "http://www.nuw.edu.cn",//124.115.173.252
        "http://javapuzzlers.com",//208.97.154.9
        "http://www.google.com",//64.233.189.147
        "http://Javapuzzlers.com",//208.97.154.9
        "http://apache2-snort.skybar.dreamhost.com"//208.97.154.9
    };
    public static void main(String[] args) throws MalformedURLException {
        // TODO Auto-generated method stub
        Set<URL> favorites = new HashSet<URL>();
        for(String urlName : URLNAMES){
            favorites.add(new URL(urlName));
        }
        System.out.println(favorites.size());
    }

}