import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.Component;
import java.awt.Container;


public class MyButtonListener implements ActionListener
{
    public void actionPerformed (ActionEvent e)
    {
	    JButton aButton = (JButton) e.getSource();	
	    MyFrame aFrame = (MyFrame) aButton.getRootPane().getParent();   
	    JLabel aLabel1 = aFrame.getLabel1();
	    JLabel aLabel2 = aFrame.getLabel2();

	    // A JFrame actually contains just one GUI component, the content pane.
	    // GUI widgets that appear to be added to the JFrame are actually added to the
	    // content pane (a container in and of itself). Get the components inside the
	    // content pane to actually get the widgets that appeared to be added to
	    // the JFrame.
	    Container aContainer = aFrame.getContentPane();
	    Component aComponent = aContainer.getComponent(0);  // First item added to array
	    if (aComponent instanceof JLabel)
	    {
		aLabel1 = (JLabel) aComponent;
		aLabel1.setText("Effect1");
	    }
	    aComponent = aContainer.getComponent(1);  // Second item added to array
	    if (aComponent instanceof JLabel)
	    {
		aLabel2 = (JLabel) aComponent;
		aLabel2.setText("Effect1");
	    }
    }
}