JAVA Swing GUI to Create Simple Program || Display Message by Clicking a Button in JAVA

A simple Programme to display Message in a non-editable Text Fields in Java by using Java Swing GUI: The Code Has provided below:

//importing classes/methods from JAVA Library
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

// Class Related to Java Swing GUI for this Programme
public class SimpleProgrammeUsingJavaSwingGUI {
// Declaration of Variable in Private
private JButton JBtnTest1;
private JPanel panelTesting;
private JTextField JtxtFldDisplayMessage;

// Constructor Class
public SimpleProgrammeUsingJavaSwingGUI() {
// Action Listener Method
JBtnTest1.addActionListener(new ActionListener() {
@Override
// Action Perform Method
public void actionPerformed(ActionEvent e) {
// Displaying Message when the button has been Clicked
JtxtFldDisplayMessage.setText("Hurray! The Button has been clicked to display message here.");
}
});
}

// Main Method
public static void main(String[] args) {
// Initialising JFRAME Method and creating a object for this.
JFrame FrameTesting = new JFrame("SimpleProgrammeUsingJavaSwingGUI");
// Calling panelTesting Variable here.
FrameTesting.setContentPane(new SimpleProgrammeUsingJavaSwingGUI().panelTesting);
FrameTesting.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
FrameTesting.pack();
FrameTesting.setVisible(true);

}
}