Java tutorial
import java.awt.FlowLayout; import javax.swing.JButton; import javax.swing.JPanel; import javax.swing.JWindow; public class Main { public static void main(String s[]) { JWindow win = new JWindow(); JPanel pan = new JPanel(); win.add(pan, "Center"); pan.setLayout(new FlowLayout()); pan.add(new JButton("Hello")); win.setSize(200, 200); win.setVisible(true); } }