Creating a frame within an applet

Creating a Frame within an Applet

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1

Objective

On completion of this period, you would be
able to know

• Creating a Frame with in an Applet

2

Recap

In the previous class, you have leant
• Different methods of Frame class
• They are necessary for working with Frames

3

Creating a Frame in an Applet

• Creating a new frame window from within an
applet is actually quite easy
• The following steps may be used to do it
1. Create a subclass of Frame
2. Override any of the standard window methods, such
as init( ), start( ), stop( ), and paint( )
3. Implement the windowClosing( ) method of the
WindowListener interface, calling setVisible(false)
when the window is closed

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Creating a Frame in an Applet contd..

• Once you have defined a Frame subclass, you
can create an object of that class
• But it will not be initially visible
• You make it visible by calling setVisible( )
• When created, the window is given a default
height and width
• You can set the size of the window explicitly by
calling the setSize( ) method


An Example Program

• The following applet creates a subclass of
Frame called SampleFrame
• A window of this subclass is instantiated within
the init( ) method of AppletFrame
• This example overrides the applet window’s
start( ) and stop( ) methods


An Example Program contd..

// Create a child frame window from
within an applet.
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
<applet code="AppletFrame"
width=300 height=50>
</applet>
*/
// Create a subclass of Frame.
class SampleFrame extends
Frame {
SampleFrame(String title) {
super(title);


// create an object to handle window events
MyWindowAdapter adapter = new
MyWindowAdapter(this);
// register it to receive those events
addWindowListener(adapter);
}
public void paint(Graphics g) {
g.drawString("This is in frame window", 10, 40);
}
}



// Create frame window.
public class AppletFrame extends Applet {
Frame f;
public void init() {
f = new SampleFrame("A Frame Window");
f.setSize(250, 250);
f.setVisible(true);
}



public void start() {
f.setVisible(true);
}
public void stop() {
f.setVisible(false);
}
public void paint(Graphics g) {
g.drawString("This is in applet window", 10, 20);
}
}



• Sample output from this program is shown here

Fig. 66.1 Output of SampleFrame program


Summary

• The steps for creating a new frame window from
within an applet are
1. Create a subclass of Frame
2. Override any of the standard window methods, such
as init( ), start( ), stop( ), and paint( )
3. Implement the windowClosing( ) method of the
WindowListener interface, calling setVisible(false)
when the window is closed


Quiz

1. Whether the Frame object is directly visible
once it is created?
a) No
b) Yes


Frequently Asked Questions

1. Write the steps for creating a frame in an applet
2. Write a program for creating a frame in an applet


Creating a frame within an applet

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