HI guys,
I wonder if you can help me understanding this please. Take the following code:
// Fig. 14.23: ListFrame.java
// JList that displays a list of colors.
import java.awt.FlowLayout;
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.ListSelectionModel;
public class ListFrame extends JFrame
{
private JList colorJList; // list to display colors
private static final String[] colorNames = { "Black", "Blue", "Cyan",
"Dark Gray", "Gray", "Green", "Light Gray", "Magenta",
"Orange", "Pink", "Red", "White", "Yellow" };
private static final Color[] colors = { Color.BLACK, Color.BLUE,
Color.CYAN, Color.DARK_GRAY, Color.GRAY, Color.GREEN,
Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE, Color.PINK,
Color.RED, Color.WHITE, Color.YELLOW };
// ListFrame constructor add JScrollPane containing JList to JFrame
public ListFrame()
{
super( "List Test" );
setLayout( new FlowLayout() ); // set frame layout
colorJList = new JList( colorNames ); // create with colorNames
colorJList.setVisibleRowCount( 5 ); // display five rows at once
// do not allow multiple selections
colorJList.setSelectionMode( ListSelectionModel.SINGLE_SELECTION );
// add a JScrollPane containing JList to frame
add( new JScrollPane( colorJList ) );
colorJList.addListSelectionListener(
new ListSelectionListener() // anonymous inner class
{
// handle list selection events
public void valueChanged( ListSelectionEvent event )
{
getContentPane().setBackground(
colors[ colorJList.getSelectedIndex() ] );
} // end method valueChanged
} // end anonymous inner class
); // end call to addListSelectionListener
} // end ListFrame constructor
} // end class ListFrame
This line colorJList = new JList( colorNames ); creates a new objects and passes a parameter - an array - to the constructur. But where is the constructor?
thanks
