330 Java Tips.pdf - FTP Server

Graphics, AWT, Swing I part
offscreen and then displaying the entire screen at once. It is called double buffering
because there are two drawing buffers and you switch between them. Use double
buffering only if the above solution alone does not work. The following code snippet
describes how to do it.
Image offscreenImage;
Graphics offscreenGraphics;
offscreenImage = createImage(size().width, size().height);
offscreenGraphics = offscreenImage.getGraphics();
offscreenGraphics.drawImage(img, 10, 10, this);
g.drawImage(offscreenImage, 0, 0, this);
The following app works fine, but when I start it, I cannot close it using the X at
the right top of the form...
Please help me on the following. I'm just starting to use java (JDK1.3). The
following app works fine, but when I start it, I cannot close it using the X
at the right top of the form. What should I add to fix this problem? The
source is shown below.
import java.awt.*;
import java.awt.event.*;
public class MyApplication extends Frame{
public static void main(String args[]){
Frame f = new Frame("MyApp");
f.setLayout(new FlowLayout());
f.add(new Button("A"));
f.setVisible(true);
}
}
Answer: You should add a listener to handle the closing of the window when the X
box gets clicked on.
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent evt){
System.exit(0);
}
});
Read on this, and other ways to do it, in the sections dealing with
event handling, in whichever Java text you are using.
How can I set a JFrame to be full screen at the start of a program? I want no
borders, no titles and I just want to use the entire screen.
Answer: Try using JWindow instead, that one can be customized to have no borders
or titles... as for size, I think you can use
setBounds(GraphicsEnvironment.getLocalGraphicsEnvironment().
getDefaultScreenDevice().getDefaultConfiguration().getBounds());
to fill out the entire screen.
Why can not I mix AWT and Swing?
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