1. Creating a Frame within an Applet
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2. Objective
On completion of this period, you would be
able to know
• Creating a Frame with in an Applet
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3. Recap
In the previous class, you have leant
• Different methods of Frame class
• They are necessary for working with Frames
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4. 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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5. 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
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6. 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
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7. 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);
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8. An Example Program contd..
// 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);
}
}
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9. An Example Program contd..
// 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);
}
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10. An Example Program contd..
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);
}
}
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11. An Example Program contd..
• Sample output from this program is shown here
Fig. 66.1 Output of SampleFrame program
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12. 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
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13. Quiz
1. Whether the Frame object is directly visible
once it is created?
a) No
b) Yes
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14. 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
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