import java.awt.BorderLayout;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
public class Main {
public static void main(String args[]) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JCheckBox checkBox = new JCheckBox("A");
checkBox.setToolTipText("Italic font");
frame.add(checkBox, BorderLayout.NORTH);
frame.setSize(300, 100);
frame.setVisible(true);
}
}