Show the given frame as modal to the specified owner : SwingUtilities « Swing « Java Tutorial

import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

import javax.swing.JFrame;

// @author Santhosh Kumar T - 
public class ModalFrameUtil {
  static class EventPump implements InvocationHandler {
    Frame frame;

    public EventPump(Frame frame) {
      this.frame = frame;

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
      return frame.isShowing();

    // when the reflection calls in this method has to be
    // replaced once Sun provides a public API to pump events.
    public void start() throws Exception {
      Class<?> clazz = Class.forName("java.awt.Conditional");
      Object conditional = Proxy.newProxyInstance(clazz.getClassLoader(), new Class[] { clazz },
      Method pumpMethod = Class.forName("java.awt.EventDispatchThread").getDeclaredMethod(
          "pumpEvents", new Class[] { clazz });
      pumpMethod.invoke(Thread.currentThread(), new Object[] { conditional });

  // show the given frame as modal to the specified owner.
  // NOTE: this method returns only after the modal frame is closed.
  public static void showAsModal(final Frame frame, final Frame owner) {
    frame.addWindowListener(new WindowAdapter() {
      public void windowOpened(WindowEvent e) {

      public void windowClosing(WindowEvent e) {

      public void windowClosed(WindowEvent e) {

    owner.addWindowListener(new WindowAdapter() {
      public void windowActivated(WindowEvent e) {
        if (frame.isShowing()) {
        } else {

    try {
      new EventPump(frame).start();
    } catch (Throwable throwable) {
      throw new RuntimeException(throwable);

14.127.1.Getting the JFrame of a Component
14.127.2.Convert a coordinate relative to a component's bounds to screen coordinates
14.127.3.Convert a coordinate on a screen to a coordinate relative to a component's bounds
14.127.4.Handle long-running tasks in a Swing application
14.127.5.Get the JFrame by getting the root of a component
14.127.6.Positions the specified frame at a relative position in the screen, where 50% is considered to be the center of the screen.
14.127.7.Positions the specified frame in the middle of the screen.
14.127.8.Positions the specified frame at a random location on the screen while ensuring that the
14.127.9.Get Window from a component
14.127.10.Center that window on the given desktop.
14.127.11.Get All Components in a container
14.127.12.Get Point For Centering
14.127.13.Is Within Parent
14.127.14.Show the given frame as modal to the specified owner
14.127.15.Change the sizes of all the passed buttons to be the size of the largest one.
14.127.16.Get Screen Bounds For
14.127.17.Returns the offset of the bracket matching the one at the specified offset of the document