Java example source code file (RemoveAfterRequest.java)

This example Java source code file (RemoveAfterRequest.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

awt, button, event, frame, gridlayout, removeafterrequest, runnable, runtimeexception, testerrorexception, testfailedexception, unexpected

The RemoveAfterRequest.java Java example source code

/*
 * Copyright (c) 2009, 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 6411406
  @summary Components automatically transfer focus on removal, even if developer requests focus elsewhere first
  @author oleg.sukhodolsky, anton.tarasov: area=awt.focus
  @library   ../../regtesthelpers
  @build Util
  @run main RemoveAfterRequest
*/

/**
 * RemoveAfterRequest.java
 *
 * summary: Components automatically transfer focus on removal, even if developer requests focus elsewhere first
 */

import java.awt.*;
import java.awt.event.*;
import test.java.awt.regtesthelpers.Util;

public class RemoveAfterRequest {
    final static Frame frame = new Frame("test frame");
    final static Button btn1 = new Button("btn1");
    final static Button btn2 = new Button("btn2");
    final static Button btn3 = new Button("btn3");

    public static void main(String[] args) {
        frame.setLayout(new GridLayout(3, 1));
        frame.add(btn1);
        frame.add(btn2);
        frame.add(btn3);
        frame.pack();
        frame.setVisible(true);

        Util.waitForIdle(null);

        if (!btn1.hasFocus()) {
            btn1.requestFocus();
            Util.waitForIdle(null);
            if (!btn1.hasFocus()) {
                throw new TestErrorException("couldn't focus " + btn1);
            }
        }

        if (!Util.trackFocusGained(btn3, new Runnable() {
                public void run() {
                    btn3.requestFocus();
                    frame.remove(btn1);
                    frame.invalidate();
                                frame.validate();
                                frame.repaint();
                }
            }, 2000, true))
        {
            throw new TestFailedException("focus request on removal failed");
        }

        System.out.println("Test passed.");
    }
}

/**
 * Thrown when the behavior being verified is found wrong.
 */
class TestFailedException extends RuntimeException {
    TestFailedException(String msg) {
        super("Test failed: " + msg);
    }
}

/**
 * Thrown when an error not related to the behavior being verified is encountered.
 */
class TestErrorException extends RuntimeException {
    TestErrorException(String msg) {
        super("Unexpected error: " + msg);
    }
}