layout's

[nitin sharma]

import java.awt.*;
public class FlowAp extends Frame{
public static void main(String argv[]){
FlowAp fa=new FlowAp();
fa.setSize(400,300);
fa.setVisible(true);
}
FlowAp(){
setLayout(new GridLayout());
add(new Panel());
add(new Button("One"));
add(new Button("Two"));
add(new Button("Three"), "North");
add(new Button("Four"), "South");
}
}
1) A Frame with buttons marked One to Four placed on a Panel
2) A panel and buttons marked One to four running from the left to right
3) A Frame with one large button marked Four in the Centre
4) An Error at run time indicating you have not set a LayoutManager properly
5) An Error at compile time indicating add is called with invalid parameters.

Please pick up the right answer and explain the reason for choosing that answer.

[sai challa]

The GridLayout() constructor creates a grid layout with a default of one column per component, in a single row .
Hence panel and buttons marked One to four running from the left to right are displayed which is answer choice 2.

[Ravindra Mohan]

Hi Nitin,
The answer to your question is (2). The reason is that
when you set the layout with <code> setLayout(new GridLayout());</code> you changed the default LayoutManager
of Frame which is BorderLayout. Now, the Layout was made with
<code>zero parameter</code> so it creates a grid layout with a default of one column per component, in a single row.
Thereafter, you added five components viz., panel, button "one" , button "two", button "three", button "four". These components
would be laid out in a row, left to right.
As far choice (5) goes, please refer the API , Frame class inherits the <code> add( ) </code> of the <code> java.awt.Container
class </code> .
Hope this clarifies your querry.
Cheers,
Ravindra Mohan.


[This message has been edited by Ravindra Mohan (edited May 04, 2001).]