Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;
import java.awt.KeyboardFocusManager;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyVetoException;
import java.beans.VetoableChangeListener;

import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.WindowConstants;

public class Main {
    public static void main(String[] args) {
        final JFrame frame = new JFrame("Test");

        KeyboardFocusManager.getCurrentKeyboardFocusManager().addVetoableChangeListener("focusedWindow",
                new VetoableChangeListener() {
                    private boolean gained = false;

                    @Override
                    public void vetoableChange(PropertyChangeEvent evt) throws PropertyVetoException {
                        if (evt.getNewValue() == frame) {
                            gained = true;
                        }
                        if (gained && evt.getNewValue() != frame) {
                            frame.dispose();
                        }
                    }
                });

        frame.add(new JTextField(10), BorderLayout.NORTH);
        frame.add(new JTextField(10), BorderLayout.SOUTH);

        frame.pack();
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}