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

class SzamitGomb extends JButton implements ActionListener {
	JTextField mezo;
	SzamitGomb(JTextField mezo) {
		this.setText("Klikkelj ide");
		this.addActionListener(this);
		this.mezo = mezo;
	}
	public void actionPerformed(ActionEvent event) {
		this.mezo.setText("Teszt ok");
	}
}
class FoAblak extends JFrame {
	SzamitGomb szamitGomb;
	JTextField mezo;
	FoAblak() {
		this.mezo = new JTextField(10);
		this.szamitGomb = new SzamitGomb(mezo);
		this.add(szamitGomb);
		this.add(mezo);
		this.setLayout(new FlowLayout());
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setSize(400, 300);
		this.setVisible(true);
	}	
}
class Program01 {
	public static void main(String args[]) {
		new FoAblak();
	}
}