A simple event based applet applications is described below
First importing the necessary header files
// Demonstrate the mouse event handlers.import java.awt.*;import java.awt.event.*;import java.applet.*;/*<applet code=”MouseEvents” width=300 height=100></applet>*/
Next step is to create a class which implements the “MouseListener” and “MouseMotionListener “
public class MouseEvents extends Applet implements MouseListener,MouseMotionListener {String msg = “”;int mouseX = 0, mouseY = 0; // coordinates of mousepublic void init(){addMouseListener(this);addMouseMotionListener(this);}
Handle mouse clicked.
public void mouseClicked(MouseEvent me) {// save coordinatesmouseX = 0;mouseY = 10;msg = “Mouse clicked.”;repaint();}
Handle mouse entered.
public void mouseEntered(MouseEvent me) {// save coordinatesmouseX = 0;mouseY = 10;msg = “Mouse entered.”;repaint();}
Handle mouse exited.
public void mouseExited(MouseEvent me) {// save coordinatesmouseX = 0;mouseY = 10;msg = “Mouse exited.”;repaint();}
Handle button pressed.
public void mousePressed(MouseEvent me) {// save coordinatesmouseX = me.getX();mouseY = me.getY();msg = “Down”;repaint();}
Handle button released.
public void mouseReleased(MouseEvent me) {// save coordinatesmouseX = me.getX();mouseY = me.getY();msg = “Up”;repaint();}
Handle mouse dragged.
public void mouseDragged(MouseEvent me) {// save coordinatesmouseX = me.getX();mouseY = me.getY();msg = “*”;showStatus(“Dragging mouse at ” + mouseX + “, ” + mouseY);repaint();}
Handle mouse moved.
public void mouseMoved(MouseEvent me) {// show statusshowStatus(“Moving mouse at ” + me.getX() + “, ” + me.getY());}
Display msg in applet window at current X,Y location. This “paint” method is called when JVM execute “repaint()” function . The “paint” method will refresh the screen
public void paint(Graphics g) {g.drawString(msg, mouseX, mouseY);}}