Java tutorial
import java.awt.BorderLayout; import javax.swing.JButton; import javax.swing.JWindow; public class Main { public static void main(String[] argv) throws Exception { JWindow window = new JWindow(); JButton component = new JButton("asdf"); // Add component to the window window.getContentPane().add(component, BorderLayout.CENTER); // Set initial size window.setSize(300, 300); // Show the window window.setVisible(true); } }