Java by API/java.awt.event/FocusAdapter
extends FocusAdapter
<source lang="java">
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) { System.out.println("gained the focus."); } public void focusLost(FocusEvent evt) { System.out.println("lost the focus."); boolean isTemporary = evt.isTemporary(); }
}
</source>