Wednesday, 26 February 2014

CREATING A FRAME WINDOW IN AN APPLET

How to create a child frame window from within an applet...........

Creating a new frame window from within an applet is actually quite easy.
The following steps may be used to do it,
  • Create a subclass of Frame
  • Override any of the standard window methods,such as init(),start(),stop(),and paint().
  • Implement the windowClosing() method of the windowlistener interface,calling setVisible(false)when the window is closed
  • Once you have defined a Frame subclass,you can create an object of that class.But it will note be initially visible
  • 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
The example program is  shown below:

// Create a child frame window from within an applet.
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
<applet code="AppletFrame" width=400 height=60>
</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);
}
}
class MyWindowAdapter extends WindowAdapter {
SampleFrame sampleFrame;
public MyWindowAdapter(SampleFrame sampleFrame) {
this.sampleFrame = sampleFrame;
}
public void windowClosing(WindowEvent we) {
sampleFrame.setVisible(false);
}
}
// Create frame window.
public class AppletFrame extends Applet {
Frame f;
public void init() {
f = new SampleFrame("A Frame Window");
f.setSize(150, 150);
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", 15, 30);
}

}

OUTPUT


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