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package Chapter12;
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 final JList<String> colorJList;
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};
public ListFrame() {
super("List Test");
setLayout(new FlowLayout());
colorJList = new JList<String>(colorNames);
colorJList.setVisibleRowCount(5);
colorJList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
add(new JScrollPane(colorJList));
colorJList.addListSelectionListener(
new ListSelectionListener() {
@Override
public void valueChanged(ListSelectionEvent event) {
getContentPane().setBackground(
colors[colorJList.getSelectedIndex()]);
}
}
);
}
}
//FIG:19.24
package Chapter12;
import javax.swing.JFrame;
public class ListTest {
public static void main(String[] args) {
ListFrame listFrame = new ListFrame();
listFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
listFrame.setSize(350, 150);
listFrame.setVisible(true);
}
}
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