import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JSlider;
import javax.swing.JTextField;
public class MainClass extends JFrame {
public MainClass() {
Box box = new Box(BoxLayout.Y_AXIS);
box.add(new JButton("Test button"));
box.add(new JSlider());
box.add(new JTextField("Text field with some text", 20));
box.add(new JButton("Another, bigger button"));
getContentPane().add(box);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
}
public static void main(String[] args) {
MainClass ex2 = new MainClass();
ex2.setVisible(true);
}
}