package com.zetcode;
import java.awt.Container;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.GroupLayout;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class QuitButtonEx extends JFrame {
public QuitButtonEx() {
initUI();
}
private void initUI() {
JButton quitButton = new JButton("Quit");
quitButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
createLayout(quitButton);
setTitle("Quit button");
setSize(300, 200);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
private void createLayout(JComponent... arg) {
Container pane = getContentPane();
GroupLayout gl = new GroupLayout(pane);
pane.setLayout(gl);
gl.setAutoCreateContainerGaps(true);
gl.setHorizontalGroup(gl.createSequentialGroup()
.addComponent(arg[0])
);
gl.setVerticalGroup(gl.createSequentialGroup()
.addComponent(arg[0])
);
}
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
QuitButtonEx ex = new QuitButtonEx();
ex.setVisible(true);
});
}
}