[ [[tutorial-en-001 | Intro]]    | [[tutorial-en-002 | Begin]] |
[[tutorial-en-003 | if/else]]    | [[tutorial-en-004 | Loops]] |
[[tutorial-en-005 | Arrays]]     | [[tutorial-en-006 | Graphics]] |
[[tutorial-en-007 | Animation]]  | [[tutorial-en-008 | Mouse]] |
[[tutorial-en-009 | Game]]       | [[tutorial-en-010 | Real]] |
[[tutorial-en-011 | Methods]]    | [[tutorial-en-012 | Class]] |
[[tutorial-en-013 | Class 2]]    | [[tutorial-en-014 | Applet]] |
[[tutorial-en-015 | MouseClick]] | [[tutorial-en-016 | Thread]] |
[[tutorial-en-017 | Button]]     ]
----
====== Java Mouse Click Method ======

In this tute I will attempt to do a rough explanation of the MouseListener
Interface. Interfaces are very hard to explain: they are like a plugin
or an adapter to allow completely different object to communicate.

===== Java  MouseListener Method =====
These are its methods:
<code java>
    public void mousePressed(MouseEvent e) {}
    public void mouseClicked(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}
    public void mouseReleased(MouseEvent e) {}
</code>

Interface uses the keyword "implements" in the class declaration
when it is being used. You must implemnet all methods of an interface.
You can leave empty any unneeded methods.

E.g.
<code java>
    import java.awt.*;
    import java.awt.event.*;
    import java.applet.*;

    public class MouseTest extends Applet implements MouseListener {
        int x, y;
        String tracer;

        public void init() {
	    addMouseListener(this);
	    setBackground(Color.red);
        }

        public void mousePressed(MouseEvent e) {
            x = e.getX() - 10;
            y = e.getY() - 10;
            tracer = " x = " + x + " y = " + y;

            // repaint the applet
            repaint();
        }

	// dont use these so leave them empty
	public void mouseClicked(MouseEvent e) {}
	public void mouseEntered(MouseEvent e) {}
	public void mouseExited(MouseEvent e) {}
	public void mouseReleased(MouseEvent e) {}

	// paint method
	public void paint(Graphics g) {
	    g.drawString(tracer, 100, 100);
	    g.drawOval(x, y, 20, 20);
	}
    }
</code>