import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.FlowLayout;
public class Main extends JFrame {
public static void main (String [] args) {
new Main ();
}
public Main () {
...
}
}
setSize (300, 300);
setLayout (new FlowLayout ());
JButton b1 = new JButton ("Push me");
add (b1);
setVisible (true);