import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JTextField;
 
class Program extends JFrame
{
	JButton kilepesgomb;
	JButton duplazasgomb;	
	JTextField szammezo;
 
	Program()
	{
		kilepesgomb = new JButton("Kilépés");
		duplazasgomb = new JButton("Dupláz");
		szammezo = new JTextField();
 
		kilepesgomb.addActionListener(new KilepesGomb_Click());
		duplazasgomb.addActionListener(new DuplazoGomb_Click());
		szammezo.setColumns(7);
 
		add(kilepesgomb);
		add(duplazasgomb);
		add(szammezo);
		setLayout(new FlowLayout());
        	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);		
		pack(); 
		setVisible(true);
	}
	class KilepesGomb_Click implements ActionListener
	{
		public void actionPerformed(ActionEvent e) 
		{
			System.exit(0);
		}
	}
	class DuplazoGomb_Click implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			String szamstr = szammezo.getText();
			int szam = Integer.parseInt(szamstr);
			int eredmeny = szam * 2;
			szammezo.setText(Integer.toString(eredmeny));			
		}
	}
	public static void main(String args[])
	{
		new Program();				
	}
}