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I have a problem with setVisible(true) !!!!!!

2 replies on 1 page. Most recent reply: Jan 5, 2003 5:11 PM by Thomas SMETS

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Reza

Posts: 1
Nickname: leon
Registered: Jan, 2003

I have a problem with setVisible(true) !!!!!!

Posted: Jan 1, 2003 7:55 AM

Hi!

Could you tell me please, how can I use the method
getSize() before I call the method setVisible(true)??

If I call the method getSize() before setVisible(true)
then return getSize() only 0 !!!!!
I must call getSize() before setVisible(true).

I tried to call the methods addNotify() and validate()
before I call the getSize() but without success!!

Thank you for your help ;-))

Code:

import java.awt.*;

class Test extends Frame
{
Test()
{
setSize(200, 100);
setLayout(new FlowLayout());
Button b=new Button("test");
add(b);
System.out.println("Size: "+ b.getSize()); //It doesn't work!!!!
setVisible(true);
}
public static void main(String args[])
{
(new Test());
}
}

robbies

Posts: 2
Nickname: robbies
Registered: Jan, 2003

Re: I have a problem with setVisible(true) !!!!!!

Posted: Jan 5, 2003 9:43 AM

class Test extends Frame
{
Test()
{
setSize(200, 100);
setLayout(new FlowLayout());
Button b=new Button("test");
add(b);
System.out.println("Size: "+ b.getSize()); //It doesn't work!!!!
//setVisible(true); It should not be used here!!!
}
public static void main(String args[])
{
Test t=new Test());
t.setVisible(true);//it should be used here

}
}

-----
Robbies
-----------------------------
1.java IDE tool : JawaBeginer
2.Java Jar tool : JavaJar

http://www.pivotonic.com
-----------------------------

Thomas SMETS

Posts: 307
Nickname: tsmets
Registered: Apr, 2002

Re: I have a problem with setVisible(true) !!!!!!

Posted: Jan 5, 2003 5:11 PM

Robbies,

You gave a working solution but you didn't explained the WHY :-))

The most likely reason the setvisible (true); or getSize (); returns 0 (zero) is that the Object (of type Frame ) is not completely built in memory, yet. The various internal state might be initialized afterwards.

It's too late for me for now, but I think it's worth trying with a JFrame

Rgds,

Thomas,

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