[hardwired]

Code:

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

public class ComponentLocation implements ActionListener {
    JButton[][] buttons = new JButton[4][4];

    public void actionPerformed(ActionEvent e) {
        JButton button = (JButton)e.getSource();
        Point gridLoc = getArrayLocation(button);
        System.out.println("gridLoc = [" + gridLoc.x +
                           ", " + gridLoc.y + "]");
    }

    private Point getArrayLocation(JButton target) {
        Point p = new Point(-1, -1);
        for(int j = 0; j < buttons.length; j++) {
            for(int k = 0; k < buttons[j].length; k++) {
                if(buttons[j][k] == target) {
                    p.setLocation(j, k);
                    return p;
                }
            }
        }
        return p;
    }

    private JPanel getContent() {
        JPanel panel  = new JPanel(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.weighty = 1.0;
        gbc.weightx = 1.0;
        for(int j = 0; j < buttons.length; j++) {
            for(int k = 0; k < buttons[j].length; k++) {
                int n = j*buttons[j].length + k + 1;
                buttons[j][k] = new JButton("Button " + n);
                buttons[j][k].addActionListener(this);
                gbc.gridwidth = (k < buttons[j].length-1) ? 1 :
                                     GridBagConstraints.REMAINDER;
                panel.add(buttons[j][k], gbc);
            }
        }
        return panel;
    }

    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new ComponentLocation().getContent());
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}