import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;

public class Layout {

	private JFrame frame;
	private JButton addBut;
	private Sentinela sentinela;

	private String[] optionsArray= {"Static class listener", "Inner class listener", "Local class listener", "Anonymous class listener"};
	private JComboBox<String> optionsList = new JComboBox<String>(optionsArray);

	public Layout() {
		frame = new JFrame("Add Buttons");
		frame.setSize(400, 500);
		addBut = new JButton("Add new Button");
		sentinela = new Sentinela();


		frame.getContentPane().add(optionsList);
		frame.getContentPane().add(addBut);

		frame.getContentPane().setLayout(new FlowLayout());

		addBut.addActionListener(sentinela);

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	}

	public class Sentinela implements ActionListener {
		public void actionPerformed(ActionEvent event) {
			JButton b = (JButton) event.getSource();
			if (b == addBut) {
				JButton newB = new JButton("Delete");
				frame.getContentPane().add(newB);
				newB.addActionListener(sentinela);
			} else
				frame.getContentPane().remove(b);
			frame.repaint();
			frame.validate();
		}
	}

	public void actionPerformed(ActionEvent event) {
		JButton b = (JButton) event.getSource();
		if (b == addBut) {
			addNewButton().addActionListener(null);
			System.out.println("new button");
		}
	}

	private JButton addNewButton() {
		JButton newButton = new JButton("Delete");
		frame.getContentPane().add(newButton, FlowLayout.LEADING);
		return newButton;
	}

	public void init() {
		frame.setVisible(true);
	}
}




































public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		Layout layout = new Layout();
		System.out.print("sdfgh");
		layout.init();
		System.out.print("sdfgh");

	}

}