Easy to Learn Java: Programming Articles, Examples and Tips

Start with Java in a few days with Java Lessons or Lectures


Code Examples

Java Tools

More Java Tools!

Java Forum

All Java Tips


Submit News
Search the site here...
Search the JavaFAQ.nu
1000 Java Tips ebook

1000 Java Tips - Click here for the high resolution copy!1000 Java Tips - Click here for the high resolution copy!

Java Screensaver, take it here

Free "1000 Java Tips" eBook is here! It is huge collection of big and small Java programming articles and tips. Please take your copy here.

Take your copy of free "Java Technology Screensaver"!.

Java: Interface Exercises

JavaFAQ Home » Java Notes by Fred Swartz Go to all tips in Java Notes by Fred Swartz

Bookmark and Share


// Note: 
//   ActionListener requires defining actionPerformed(...)
//   MouseMotionListener requires defining mouseMoved(...) and MouseDragged(...).

public class MyPanel extends JPanel implements ActionListener, MouseMotionListener {
    public void actionPerformed(ActionEvent e) {
        /* Method body */
    public void mouseDragged(MouseEvent me) {
        /* Method body */
    public void mouseMoved(MouseEvent me) {
        /* Method body */
    // Everything else in this class.


What is the output from these statements, given the MyPanel class as defined above?

// Note: Neither JPanel nor its ancestors (superclasses)
//       implements ActionListener or MouseMotionListener.
JPanel p    = new JPanel();
MyPanel myp = new MyPanel();
ActionListener al;
MouseMotionListener mml;

al  = myp;

System.out.println("1. " + (p   instanceof JPanel));
System.out.println("2. " + (myp instanceof JPanel));
System.out.println("3. " + (p   instanceof MyPanel));
System.out.println("4. " + (p   instanceof ActionListener));
System.out.println("5. " + (myp instanceof ActionListener));
System.out.println("6. " + (al  instanceof JPanel));
System.out.println("7. " + (al  instanceof MyPanel));

 Printer Friendly Page  Printer Friendly Page
 Send to a Friend  Send to a Friend

.. Bookmark and Share

Search here again if you need more info!
Custom Search

Home Code Examples Java Forum All Java Tips Books Submit News, Code... Search... Offshore Software Tech Doodling

RSS feed Java FAQ RSS feed Java FAQ News     

    RSS feed Java Forums RSS feed Java Forums

All logos and trademarks in this site are property of their respective owner. The comments are property of their posters, all the rest 1999-2006 by Java FAQs Daily Tips.

Interactive software released under GNU GPL, Code Credits, Privacy Policy