创建类型

import java.net.MalformedURLException;/* 来 自 NowJava.com*/

import java.net.URL;

import java.util.ArrayList;

import java.util.List;


public class Main {


  public void m() {

    List<Integer> intlist = new ArrayList<Integer>();


    intlist.add(new Integer(123));

    intlist.add(null);

    List<Number> numlist = new ArrayList<Number>();


    numlist.add(new Integer(123));

    numlist.add(new Float(123));

    List<URL> urlList = new ArrayList<URL>();

    try {
    /** 
     来自 nowjava**/

      urlList.add(