Frame in focus

Question

i have 2 frames. how do i work out which one is in focus i.e. the last frame clicked?

Answer 1

Here's an example that uses a focus listener:import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Test extends JFrame implements FocusListener {
    private JLabel focusLabel;
    public Test (int x, int y, int xCount, int yCount) {
        super ("Have I got focus?");
        focusLabel = new JLabel ();
        focusLabel.setHorizontalAlignment (SwingConstants.CENTER);
        getContentPane ().add (focusLabel);
        addFocusListener (this);
        Dimension screenSize = Toolkit.getDefaultToolkit ().getScreenSize ();
        int width = (screenSize.width - 100) / xCount;
        int height = (screenSize.height - 100) / yCount;
        setSize (width - 1, height - 1);
        setLocation (50 + x * width, 50 + y * height);
        setDefaultCloseOperation (EXIT_ON_CLOSE);
        setResizable (false);
        show ();
    public void focusGained (FocusEvent event) {
        setFocusLabelText ("I've got focus!");
    public void focusLost (FocusEvent event) {
        setFocusLabelText ("");
    private void setFocusLabelText (String text) {
        focusLabel.setText (text);
        focusLabel.invalidate ();
        validate ();
    public static void main (String[] parameters) {
        try {
            int xCount = Integer.parseInt (parameters[0]);
            int yCount = Integer.parseInt (parameters[1]);
            for (int x = 0; x < xCount; x ++) {
                for (int y = 0; y < yCount; y ++) {
                    new Test (x, y, xCount, yCount);
        } catch (Exception exception) {
            System.err.println ("Usage: java Test [xCount] [yCount]");
            System.exit (-1);
}Kind regards,
Levi