swing中控制Tooltip显示和隐藏的方法

 
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class a {
        public static void main(String[] args) {
                ToolTipManager.sharedInstance().setDismissDelay(20000);
                final JPanel panel = new JPanel();
                final JButton btn1 = new JButton("显示");
                panel.add(btn1);
                final JButton btn2 = new JButton("隐藏");
                panel.add(btn2);
                final JButton btn3 = new JButton("提示按钮");
                btn3.setToolTipText("button_tooltip");
                panel.add(btn3);
                btn1.addActionListener(new ActionListener() {
                        public void actionPerformed(ActionEvent e) {
                                postToolTip(btn3);
                        }
                });

                btn2.addActionListener(new ActionListener() {
                        public void actionPerformed(ActionEvent e) {
                                hideToolTip(btn3);
                        }
                });
                JFrame frame = new JFrame();
                frame.setContentPane(panel);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setSize(500, 400);
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
        }

        public static void postToolTip(JComponent comp) {
                Action action = comp.getActionMap().get("postTip");
                ActionEvent ae = new ActionEvent(comp, ActionEvent.ACTION_PERFORMED,
                                "postTip", EventQueue.getMostRecentEventTime(), 0);
                action.actionPerformed(ae);
        }

        public static void hideToolTip(JComponent comp) {
                Action action = comp.getActionMap().get("hideTip");
                if (action == null) // no tooltip
                        return;
                ActionEvent ae = new ActionEvent(comp, ActionEvent.ACTION_PERFORMED,
                                "hideTip", EventQueue.getMostRecentEventTime(), 0);
                action.actionPerformed(ae);
        }

}