import javax.swing.*; public class MyFrame { public static void main(String[] args) { JFrame frame = new JFrame("MyFrame"); // Create a frame frame.setSize(400, 300); // Set the frame size frame.setLocationRelativeTo(null); // New since JDK 1.4 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); // Display the frame } }