JAVA - JFrame

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package tjframe;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

class TJFrame extends JFrame {

    Container container = null;

    // 1. Create a Swing frame.

    public TJFrame(String title) {

        super(title);  // set the title for the frame

        // 2. Get the content pane of the frame and

        // configure the frame using its content pane.

        container = this.getContentPane();

        container.setBackground(Color.white);

        container.setForeground(Color.blue);

        // 3. Create a label and add it to the frame.

        JLabel label = new JLabel("This is a Swing frame",

                                 JLabel.CENTER);

        label.setFont(new Font("Sans", Font.PLAIN, 22));        

        container.add(label);

        // 4. Add the window listener to close the frame

        // and display it with the specified size.

        addWindowListener(new WindowEventHandler());       

        setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

        setSize(350, 200); // width=350, height=200

        show(); // Display the frame

    }

    // 5. The main method.

    public static void main(String[] args) {

        TJFrame frame = new TJFrame("Swing Frame");        

    }

    // 6. The listener class to handle closing of the frame.

    class WindowEventHandler extends WindowAdapter {

        public void windowClosing(WindowEvent evt) {

            System.exit(0);

        }

    }   

}