import javax.swing.JButton;
import javax.swing.JFrame;
import java.awt.Dimension;

class Ablak extends JFrame {

        JButton GombElso;
        Ablak() {
                this.setSize(new Dimension(450, 130));
                GombElso = new JButton();
                this.setVisible(true);
                this.setLayout(null);

                GombElso.setText("Valami");
                GombElso.setBounds(10,10, 100, 50);
                this.add(GombElso);
        }

        public static void main(String args[]) {
                new Ablak();
        }
}