Java Swing - 如何当光标移动到复选框上时显示图标

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JCheckBox;

public class Main {
  public static void main(String[] argv) throws Exception {

    JCheckBox checkbox = new JCheckBox();

    Icon rollIcon = new ImageIcon("roll-icon.gif");
    checkbox.setRolloverIcon(rollIcon);

  }
}