?? ex0urlclassloader.java
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package org.jboss.book.jmx.ex0;import java.net.URLClassLoader;import java.net.URL;import org.apache.log4j.Logger;/** A custom class loader that overrides the standard parent delegation model * @author Scott.Stark@jboss.org * @version $Revision: 1.1 $ */public class Ex0URLClassLoader extends URLClassLoader{ private static Logger log = Logger.getLogger(Ex0URLClassLoader.class); private Ex0URLClassLoader delegate; public Ex0URLClassLoader(URL[] urls) { super(urls); } void setDelegate(Ex0URLClassLoader delegate) { this.delegate = delegate; } protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException { Class clazz = null; if( delegate != null ) { log.debug(Integer.toHexString(hashCode())+"; Asking delegate to loadClass: "+name); clazz = delegate.loadClass(name, resolve); log.debug(Integer.toHexString(hashCode())+"; Delegate returned: "+clazz); } else { log.debug(Integer.toHexString(hashCode())+"; Asking super to loadClass: "+name); clazz = super.loadClass(name, resolve); log.debug(Integer.toHexString(hashCode())+"; Super returned: "+clazz); } return clazz; } protected Class findClass(String name) throws ClassNotFoundException { Class clazz = null; log.debug(Integer.toHexString(hashCode())+"; Asking super to findClass: "+name); clazz = super.findClass(name); log.debug(Integer.toHexString(hashCode())+"; Super returned: "+clazz); return clazz; }}?? 快捷鍵說明
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