Add tooltip to Swing controls in Java

  //from   w ww.  j a v a  2 s  .  c om
import javax.swing.JButton;
import javax.swing.JFrame;
public class Main{
  public static void main(String args[]) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JButton b = new JButton("Hello, World");
    frame.add(b,"Center");
    b.setToolTipText("asdf");
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}