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vasu
Guest
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 Posted: Mon Jul 18, 2005 1:30 am Post subject: problem in coding window |
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hi ,
i am new with java and am learning it from Schildt's complete
reference, i try to convert an applet example there to a window
program, it got compiled but result is not
as expected it is only showing the last checkbox, plz help me with
corrections or correct code
import java.awt.*;
import java.awt.event.*;
public class CBGroup extends Frame
{
String msg;
Checkbox win98,winNT,solaris,mac;
//CheckboxGroup cbg=new CheckboxGroup();
public CBGroup()
{
//cbg=new CheckboxGroup();
win98=new Checkbox("Windows 98/XP",true);
winNT=new Checkbox("Windows NT/2000",false);
solaris=new Checkbox("Solaris",false);
mac=new Checkbox("MacOS",false);
add(win98);
add(winNT);
add(solaris);
add(mac);
win98.addItemListener(new myItemAdapter(this));
winNT.addItemListener(new myItemAdapter(this));
solaris.addItemListener(new myItemAdapter(this));
mac.addItemListener(new myItemAdapter(this));
//addItemListener(new myItemAdapter(this));
addWindowListener(new myWindowAdapter());
}
public void paint(Graphics g)
{
msg="Current Selection : ";
//msg += cbg.getSelectedCheckbox().getLabel();
g.drawString(msg,6,100);
}
public static void main(String args[])
{ CBGroup cbgroup=new CBGroup();
cbgroup.setSize(new Dimension(900,600));
cbgroup.setTitle("A Linux X Window Application");
cbgroup.setVisible(true);
}
}
class myItemAdapter implements ItemListener
{
CBGroup cbg;
public myItemAdapter(CBGroup cbg)
{
this.cbg=cbg;
}
public void itemStateChanged(ItemEvent ie)
{
cbg.repaint();
}
}
class myWindowAdapter extends WindowAdapter
{
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
}
----------------
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Mark
Guest
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| Posted: Mon Jul 18, 2005 2:43 am Post subject: Re: problem in coding window |
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vasu wrote:
| Quote: | hi ,
i am new with java and am learning it from Schildt's complete
reference, i try to convert an applet example there to a window
program, it got compiled but result is not
as expected it is only showing the last checkbox, plz help me with
corrections or correct code
import java.awt.*;
import java.awt.event.*;
public class CBGroup extends Frame
{
String msg;
Checkbox win98,winNT,solaris,mac;
//CheckboxGroup cbg=new CheckboxGroup();
public CBGroup()
{
//cbg=new CheckboxGroup();
win98=new Checkbox("Windows 98/XP",true);
winNT=new Checkbox("Windows NT/2000",false);
solaris=new Checkbox("Solaris",false);
mac=new Checkbox("MacOS",false);
add(win98);
add(winNT);
add(solaris);
add(mac);
win98.addItemListener(new myItemAdapter(this));
winNT.addItemListener(new myItemAdapter(this));
solaris.addItemListener(new myItemAdapter(this));
mac.addItemListener(new myItemAdapter(this));
//addItemListener(new myItemAdapter(this));
addWindowListener(new myWindowAdapter());
}
public void paint(Graphics g)
{
msg="Current Selection : ";
//msg += cbg.getSelectedCheckbox().getLabel();
g.drawString(msg,6,100);
}
public static void main(String args[])
{ CBGroup cbgroup=new CBGroup();
cbgroup.setSize(new Dimension(900,600));
cbgroup.setTitle("A Linux X Window Application");
cbgroup.setVisible(true);
}
}
class myItemAdapter implements ItemListener
{
CBGroup cbg;
public myItemAdapter(CBGroup cbg)
{
this.cbg=cbg;
}
public void itemStateChanged(ItemEvent ie)
{
cbg.repaint();
}
}
class myWindowAdapter extends WindowAdapter
{
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
}
----------------
The default layout of a Frame is the BorderLayout. You do not specify |
where the Checkbox items are to be added, so I assume they all go to the
same place, and get put atop one another, so that only the last one
shows. Specify a FlowLayout just before you do your add, and you will
see your all the CheckBox items:
setLayout(new FlowLayout());
add(win98);
add(winNT);
add(solaris);
add(mac);
You will need to study layout managers, and you might want to look at
using Swing instead of the old and limited AWT.
Mark
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