For detecting clicks inside a JTextField instance, you would simply add a
mouse-listener or
mouse-adapter to your instance.

This might help:
----------------

package org.blahblah;

import javax.swing.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class ClickOnTextField {

public static void main(String[] args) {

JFrame frame = new JFrame();
JTextField field = new JTextField();

frame.add(field);

field.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
System.out.println("Mouse Clicked");
}
});

frame.pack();
frame.setVisible(true);
}

}