import java.net.*;
import java.util.*;
import java.io.*;

/**
 * Description:
 * <br/>Copyright (C), 2008-2010, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public class ClassLoaderPropTest
{
	public static void main(String[] args)
		throws IOException
	{
		//獲取系統類加載器
		ClassLoader systemLoader = 
			ClassLoader.getSystemClassLoader();
		System.out.println("系統類加載器：" + systemLoader);
		/*
		獲取系統類加載器的加載路徑——通常由CLASSPATH環境變量指定
		如果操作系統沒有指定CLASSPATH環境變量，默認以當前路徑作為
		系統類加載器的加載路徑
		*/
		Enumeration<URL> em1 = systemLoader.getResources("");
		while(em1.hasMoreElements())
		{
			System.out.println(em1.nextElement());
		}
 		//獲取系統類加載器的父類加載器——應該得到擴展類加載器
		ClassLoader extensionLader = systemLoader.getParent();
		System.out.println("擴展類加載器：" + extensionLader);
		System.out.println("擴展類加載器的加載路徑：" + System.getProperty("java.ext.dirs"));
		System.out.println("擴展類加載器的parent: " 
			+ extensionLader.getParent());
	}
}