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Groovy example source code file (Demo.java)

This example Groovy source code file (Demo.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

classloader, demo, demo, exception, exception, file, groovyclassloader, groovyclassloader, groovycodesource, groovyobject, groovyobject, groovytestcase, io, object, privilegedaction, security

The Groovy Demo.java source code

 * Copyright 2003-2010 the original author or authors.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package groovy.swing;

import groovy.lang.GroovyObject;
import groovy.lang.GroovyCodeSource;
import groovy.lang.GroovyClassLoader;
import groovy.util.GroovyTestCase;

import java.io.File;
import java.security.AccessController;
import java.security.PrivilegedAction;

 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @version $Revision: 20587 $
public class Demo extends GroovyTestCase {
    ClassLoader parentLoader = getClass().getClassLoader();
    protected GroovyClassLoader loader =
        (GroovyClassLoader) AccessController.doPrivileged(new PrivilegedAction() {
            public Object run() {
                return new GroovyClassLoader(parentLoader);

    public static void main(String[] args) throws Exception {
        Demo demo = new Demo();
        GroovyObject object = demo.compile("src/examples/groovy/swing/SwingDemo.groovy");
        object.invokeMethod("run", null);

    protected GroovyObject compile(String fileName) throws Exception {
        Class groovyClass = loader.parseClass(new GroovyCodeSource(new File(fileName)));
        GroovyObject object = (GroovyObject) groovyClass.newInstance();
        assertTrue(object != null);
        return object;

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