Add button functionality to the resulting GUI of number 2 above. When the button is clicked, the title of the window changes to “Modified First Window”.

Question

What will be an ideal response?

Answer 1

Additional code for button functionality appears below in bold text.
```
import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class FirstGui
{
public static final int WIDTH = 300;
public static final int HEIGHT = 300;

public static void main(String args[])
{
final JFrame window = new JFrame();
window.setSize(WIDTH, HEIGHT);

JButton btnClick = new JButton("Click Me");
window.getContentPane().add(btnClick);

btnClick.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
window.setTitle("Modified First Window");
}
});

window.setTitle("First Window");
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setVisible(true);
}
}
```