Graphical User Interfaces - Java - page 553

The default for JFrame and JWindow is BorderLayout . This explains the problem of the
single button appearing in the JFrameDemo class at the end of the previous recipe. Border-
Layout divides the screen into the five areas shown in Figure 14-1 . If you don't specify
where to place a component, it goes into the center. And if you place multiple components in
the same region (perhaps by adding several components without specifying where to place
them!), only the last one appears.

Figure 14-1. BorderLayout's five regions

So we can fix the previous version of the JFrameDemo in one of two ways: either we can use
a FlowLayout or specify BorderLayout regions for the label and the button. The former be-
ing simpler, we'll try it out:

public public class class JFrameFlowLayout JFrameFlowLayout extends extends JFrame {

public public JFrameFlowLayout () {

Container cp = getContentPane ();

// Make sure it has a FlowLayout layoutmanager.
cp . setLayout ( new new FlowLayout ());

// now add Components to "cp"...
cp . add ( new new JLabel ( "Wonderful?" ));

cp . add ( new

new JButton ( "Yes!" ));

pack ();

}