Chapter vi(class applet)

• applications live and run inside the Web
browser’s window.
• How to run JavaApplet
– Create File: A.java
– Compile: A.java=> A.class
– Create and Open A.html
• there are two varieties of applets:
– applets use the Abstract Window Toolkit (AWT)
– Swing class Japplet

A.Java
import java.applet.*;
import java.awt.*;
public class A extends Applet{
private int w, h;
public void init( )
{
w = 45;
h = 50;
}
public void paint(Graphics g){
g.drawRect(w, h, 20, 80);
}
}
A.html
<html>
<applet code="A.class" height=200 width=320>
</applet>
</html>

public class JappletTest1 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 applet's window must be restored.
public void paint(Graphics g) {
// redisplay contents of window
}
}

import java.awt.*;
public class Japplet1 extends Applet{
String msg;
setBackground(Color.cyan);
setForeground(Color.red);
msg = "Inside init( ) --";
}
public void start(){
msg += " Inside start( ) --";
}
msg += " Inside paint( ).";
g.drawString(msg, 10, 30);
}
}

import java.awt.*;
import java.awt.event.*;
public class AppletFrame extends Applet implements ActionListener {
String msg = "";
Button yes, no, maybe;
yes = new Button("Yes");
no = new Button("No");
maybe = new Button("Undecided");
add(yes);
add(no);
add(maybe);
yes.addActionListener(this);
no.addActionListener(this);
maybe.addActionListener(this);
}
public void actionPerformed(ActionEvent ae) {
String str = ae.getActionCommand();
if(str.equals("Yes")) {
msg = "You pressed Yes.";
}
else if(str.equals("No")) {
msg = "You pressed No.";
}
else {
msg = "You pressed Undecided.";
}
repaint();
}
g.drawString(msg, 6, 100);
}
}

Chapter vi(class applet)

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