openjdk源码
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/*
* Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.net.*;
import java.io.*;
/*
* Regression test for URLClassLoader getURLs() and addURL() methods.
* See RFE 4102580: Need URLClassLoader.getURLs() method
*/
class GetURLsTest {
public static void main(String[] args) throws Exception {
MyURLClassLoader ucl =
new MyURLClassLoader(new URL[] { new File(".").toURL() });
p("initial urls = ", ucl.getURLs());
URL u = ucl.getResource("GetURLsTest.java");
if (u != null) {
p("found resource = " + u);
}
ucl.addURL(new File("jars", "class_path_test.jar").toURL());
p("new urls = ", ucl.getURLs());
Class c = ucl.loadClass("Foo");
p("found class = " + c);
}
static class MyURLClassLoader extends URLClassLoader {
public MyURLClassLoader(URL[] urls) {
super(urls);
}
public void addURL(URL url) {
super.addURL(url);
}
}
static void p(String s, URL[] urls) {
System.out.print(s);
if (urls.length > 0) {
for (int i = 0; i < urls.length - 1; i++) {
System.out.print(urls[i] + " ");
}
}
System.out.println(urls[urls.length - 1]);
}
static void p(String s) {
System.out.println(s);
}
}