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import java.awt.Component;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Main {
public static void main(String[] argv) throws Exception {
JButton component = new JButton("a");
component.addFocusListener(new MyFocusListener());
JFrame f = new JFrame();
f.add(component);
f.pack();
f.setVisible(true);
}
}
class MyFocusListener extends FocusAdapter {
public void focusGained(FocusEvent evt) {
Component c = evt.getOppositeComponent();
System.out.println(c.getName());
}
public void focusLost(FocusEvent evt) {
Component c = evt.getOppositeComponent();
System.out.println(c.getName() + "Opposite Component");
}
}
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