Swing I - Java - page 954

16. You need to change the add statements, as in the following rewritten section of

code:

JLabel label1 = new JLabel("First label");
add(label1, BorderLayout.NORTH);

JLabel label2 = new JLabel("Second label");
add(label2, BorderLayout.EAST);

JLabel label3 = new JLabel("Third label");
add(label3, BorderLayout.SOUTH);

17. The argument should be new GridLayout(1, 3) . So, the entire method invocation is

setLayout( new GridLayout(1, 3));

Alternatively, you could use new GridLayout(1, 0) . It is also possible to do
something similar with a BorderLayout manager or a FlowLayout manager, but a
GridLayout manager will work nicer here.

18. The argument should be new GridLayout(0, 1) . So, the entire method invocation is

setLayout( new GridLayout(0, 1));

Alternatively, you could use new GridLayout(3, 1) , if you know there will be at
most three components added, but if more than three components are added,
then a second column will be added. It is also possible to do something similar
with a BorderLayout manager, but a GridLayout manager will work nicer here.
19. java.awt

20. An object of the class JPanel is both a container class and a component class.
21. To make it look as though you have an empty grid element, add an empty panel
to the grid element.
22. import javax.swing.JPanel;
import java.awt.Color;

public class PinkJPanel extends JPanel
{
public PinkJPanel()
{
setBackground(Color.PINK);
}
}

extra code
on CD

The class PinkJPanel is on the CD that accompanies this text.

23. It will not compile, but will give a compiler error message saying that action-

Performed is not defined (since it claims to implement the ActionListener
interface).