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JHVFJ

import javax.swing.JFrame;

public class MyGUI {
    public static void main(String[] args) {
        JFrame frame = new JFrame("My First GUI"); // Create a new JFrame
        frame.setSize(400, 300); // Set the size of the window (width, height)
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Close operation
        frame.setVisible(true); // Make the window visible
    }
}