Java tutorial
import java.awt.Container; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import javax.swing.JButton; import javax.swing.JFrame; public class Main { public static void main(String[] args) { JFrame frame = new JFrame("JFrame"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container contentPane = frame.getContentPane(); JButton closeButton = new JButton("Close"); contentPane.add(closeButton); closeButton.addActionListener(e -> System.exit(0)); // Add a MouseListener to the JButton closeButton.addMouseListener(new MouseListener() { @Override public void mouseClicked(MouseEvent e) { } @Override public void mousePressed(MouseEvent e) { } @Override public void mouseReleased(MouseEvent e) { } @Override public void mouseEntered(MouseEvent e) { closeButton.setText("Mouse has entered!"); } @Override public void mouseExited(MouseEvent e) { closeButton.setText("Mouse has exited!"); } }); frame.pack(); frame.setVisible(true); } }