Double-click events in Java Swing

Today, I wrote a small program encountered this problem, in the online search for someone else's ideas, sorting out the code can run, feel good!
A new application is created directly in JBuilder, as the specific steps do not describe, this code does not run directly without the main function. Below I post the code in FRAME1:
Import java.awt.*;
Import java.awt.event.*;
Import javax.swing.*;
Import com.borland.jbcl.layout.*;
Import Java.util.Date;

public class Frame1
Extends JFrame {
JPanel ContentPane;
BorderLayout borderLayout1 = new BorderLayout ();
JPanel JPanel1 = new JPanel ();
Xylayout xYLayout1 = new Xylayout ();
JScrollPane jScrollPane1 = new JScrollPane ();
JList jList1 = new JList ();
The data in the initialized JList
String[] Strdata = {
"One", "Tow", "Three"};
Time to save the click button
Long clicktime = 0;

Construct the Frame
Public Frame1 () {
EnableEvents (Awtevent.window_event_mask);
try {
Jbinit ();
}
catch (Exception e) {
E.printstacktrace ();
}
}

Component initialization
private void Jbinit () throws Exception {
ContentPane = (JPanel) this.getcontentpane ();
Contentpane.setlayout (BORDERLAYOUT1);
This.setsize (New Dimension (532, 468));
This.settitle ("Frame Title");

Jpanel1.setlayout (XYLAYOUT1);
Jlist1.addmouselistener (This) (new Frame1_jlist1_mouseadapter);
Contentpane.add (JPanel1, Borderlayout.center);
Jpanel1.add (JScrollPane1, New Xyconstraints (18, 34, 209, 326));
Jscrollpane1.getviewport (). Add (JList1, NULL);
Jlist1.setlistdata (strdata);
}

Overridden so we can exit as window is closed
protected void processWindowEvent (WindowEvent e) {
Super.processwindowevent (e);
if (e.getid () = = windowevent.window_closing) {
System.exit (0);
}
}

The implementation of the button to double-click the function of the method, very simple algorithm, do not explain the
public Boolean checkclicktime () {
Long Nowtime = (new Date ()). GetTime ();

if ((Nowtime-clicktime) < 300) {
Clicktime = Nowtime;
return true;
}
Clicktime = Nowtime;
return false;

}

void jlist1_mousereleased (MouseEvent e) {
To decide whether to double-click, is to write the function you want to implement
if (Checkclicktime ()) {
System.out.println ("click Double");

}
}
}

Class Frame1_jlist1_mouseadapter
Extends Java.awt.event.MouseAdapter {
Frame1 adaptee;

Frame1_jlist1_mouseadapter (Frame1 adaptee) {
This.adaptee = Adaptee;
}

public void mousereleased (MouseEvent e) {
Adaptee.jlist1_mousereleased (e);
}
}