listing 1

// A minimal AWT-based applet.

import java.awt.*;

import java.applet.*;

public class SimpleApplet extends Applet {

public void paint(Graphics g) {

g.drawString("Java makes applets easy.", 20, 20);

}

}

listing 2

import java.awt.*;

import java.applet.*;

/*

<applet code="SimpleApplet" width=200 height=60>

</applet>

*/

public class SimpleApplet extends Applet {

public void paint(Graphics g) {

g.drawString("Java makes applets easy.", 20, 20);

}

}

listing 3

// An AWT-based Applet skeleton.

import java.awt.*;

import java.applet.*;

/*

<applet code="AppletSkel" width=300 height=100>

</applet>

*/

public class AppletSkel extends Applet {

// Called first.

public void init() {

// initialization

}

/* Called second, after init(). Also called whenever

the applet is restarted. */

public void start() {

// start or resume execution

}

// Called when the applet is stopped.

public void stop() {

// suspends execution

}

/* Called when applet is terminated. This is the last

method executed. */

public void destroy() {

// perform shutdown activities

}

// Called when an AWT-based applet's window must be restored.

public void paint(Graphics g) {

// redisplay contents of window

}

}

listing 4

/*

Try This 14-1

A simple banner applet.

This applet creates a thread that scrolls

the message contained in msg right to left

across the applet's window.

*/

import java.awt.*;

import java.applet.*;

/*

<applet code="Banner" width=300 height=50>

</applet>

*/

public class Banner extends Applet implements Runnable {

String msg = " Java Rules the Web ";

Thread t;

boolean stopFlag;

// Initialize t to null.

public void init() {

t = null;

}

// Start thread

public void start() {

t = new Thread(this);

stopFlag = false;

t.start();

}

// Entry point for the thread that runs the banner.

public void run() {

// Display banner

for( ; ; ) {

try {

repaint();

Thread.sleep(250);

if(stopFlag)

break;

} catch(InterruptedException exc) {}

}

}

// Pause the banner.

public void stop() {

stopFlag = true;

t = null;

}

// Display the banner.

public void paint(Graphics g) {

char ch;

ch = msg.charAt(0);

msg = msg.substring(1, msg.length());

msg += ch;

g.drawString(msg, 50, 30);

}

}

listing 5

// Using the Status Window.

import java.awt.*;

import java.applet.*;

/*

<applet code="StatusWindow" width=300 height=50>

</applet>

*/

public class StatusWindow extends Applet{

// Display msg in applet window.

public void paint(Graphics g) {

g.drawString("This is in the applet window.", 10, 20);

showStatus("This is shown in the status window.");

}

}

listing 6

// Pass a parameter to an applet.

import java.awt.*;

import java.applet.*;

/*

<applet code="Param" width=300 height=80>

<param name=author value="Herb Schildt">

<param name=purpose value="Demonstrate Parameters">

<param name=version value=2>

</applet>

*/

public class Param extends Applet {

String author;

String purpose;

int ver;

public void start() {

String temp;

author = getParameter("author");

if(author == null) author = "not found";

purpose = getParameter("purpose");

if(purpose == null) purpose = "not found";

temp = getParameter("version");

try {

if(temp != null)

ver = Integer.parseInt(temp);

else

ver = 0;

} catch(NumberFormatException exc) {

ver = -1; // error code

}

}

public void paint(Graphics g) {

g.drawString("Purpose: " + purpose, 10, 20);

g.drawString("By: " + author, 10, 40);

g.drawString("Version: " + ver, 10, 60);

}

}

listing 7

// Demonstrate the mouse event handlers.

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

/*

<applet code="MouseEvents" width=300 height=100>

</applet>

*/

public class MouseEvents extends Applet

implements MouseListener, MouseMotionListener {

String msg = "";

int mouseX = 0, mouseY = 0; // coordinates of mouse

public void init() {

addMouseListener(this);

addMouseMotionListener(this);

}

// Handle mouse clicked.

public void mouseClicked(MouseEvent me) {

mouseX = 0;

mouseY = 10;

msg = "Mouse clicked.";

repaint();

}

// Handle mouse entered.

public void mouseEntered(MouseEvent me) {

mouseX = 0;

mouseY = 10;

msg = "Mouse entered.";

repaint();

}

// Handle mouse exited.

public void mouseExited(MouseEvent me) {

mouseX = 0;

mouseY = 10;

msg = "Mouse exited.";

repaint();

}

// Handle button pressed.

public void mousePressed(MouseEvent me) {

// save coordinates

mouseX = me.getX();

mouseY = me.getY();

msg = "Down";

repaint();

}

// Handle button released.

public void mouseReleased(MouseEvent me) {

// save coordinates

mouseX = me.getX();

mouseY = me.getY();

msg = "Up";

repaint();

}

// Handle mouse dragged.

public void mouseDragged(MouseEvent me) {

// save coordinates

mouseX = me.getX();

mouseY = me.getY();

msg = "*";

showStatus("Dragging mouse at " + mouseX + ", " + mouseY);

repaint();

}

// Handle mouse moved.

public void mouseMoved(MouseEvent me) {

// show status

showStatus("Moving mouse at " + me.getX() + ", " + me.getY());

}

// Display msg in applet window at current X,Y location.

public void paint(Graphics g) {

g.drawString(msg, mouseX, mouseY);

}

}