import javax.swing.*;

public class MojeOkno extends JFrame{
	public MojeOkno(){
		setSize(100, 100);
		JButton gumb = new JButton("PRITISNI ME!");
		add(gumb);
		setVisible(true);
	}
	public static void main(String s[]){
		MojeOkno mo = new MojeOkno();
	}
}