Java example source code file (Test8015926.java)

This example Java source code file (Test8015926.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

child, defaultmutabletreenode, defaulttreemodel, event, exception, gui, jframe, jtree, override, runnable, swing, test8015926, throwable, tree, treemodellistener

The Test8015926.java Java example source code

/*
 * Copyright (c) 2013, 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.
 */

/*
 * @test
 * @bug 8015926
 * @summary Tests that there are no NPE during painting
 * @author Sergey Malenkov
 */

import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

import static javax.swing.WindowConstants.DISPOSE_ON_CLOSE;

public class Test8015926 implements TreeModelListener, Runnable, Thread.UncaughtExceptionHandler {

    public static void main(String[] args) throws Exception {
        UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
        SwingUtilities.invokeAndWait(new Test8015926());
        Thread.sleep(1000L);
    }

    private JTree tree;

    @Override
    public void treeStructureChanged(TreeModelEvent event) {
    }

    @Override
    public void treeNodesRemoved(TreeModelEvent event) {
    }

    @Override
    public void treeNodesInserted(TreeModelEvent event) {
        this.tree.expandPath(event.getTreePath());
    }

    @Override
    public void treeNodesChanged(TreeModelEvent event) {
    }

    @Override
    public void run() {
        Thread.currentThread().setUncaughtExceptionHandler(this);

        DefaultMutableTreeNode root = new DefaultMutableTreeNode();
        DefaultMutableTreeNode child = new DefaultMutableTreeNode("Child");
        DefaultTreeModel model = new DefaultTreeModel(root);

        this.tree = new JTree();
        this.tree.setModel(model);

        JFrame frame = new JFrame(getClass().getSimpleName());
        frame.add(this.tree);

        model.addTreeModelListener(this); // frame is not visible yet
        model.insertNodeInto(child, root, root.getChildCount());
        model.removeNodeFromParent(child);

        frame.setSize(640, 480);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        frame.setVisible(true);
    }

    @Override
    public void uncaughtException(Thread thread, Throwable exception) {
        exception.printStackTrace();
        System.exit(1);
    }
}