Applet and Swing Components
// : c14:List.java
// <applet code=List width=250 height=375></applet>
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.DefaultListModel;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JTextArea;
import javax.swing.border.Border;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class List extends JApplet {
private String[] flavors = { "Chocolate", "Strawberry",
"Vanilla Fudge Swirl", "Mint Chip", "Mocha Almond Fudge",
"Rum Raisin", "Praline Cream", "Mud Pie" };
private DefaultListModel lItems = new DefaultListModel();
private JList lst = new JList(lItems);
private JTextArea t = new JTextArea(flavors.length, 20);
private JButton b = new JButton("Add Item");
private ActionListener bl = new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (count < flavors.length) {
lItems.add(0, flavors[count++]);
} else {
// Disable, since there are no more
// flavors left to be added to the List
b.setEnabled(false);
}
}
};
private ListSelectionListener ll = new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting())
return;
t.setText("");
Object[] items = lst.getSelectedValues();
for (int i = 0; i < items.length; i++)
t.append(items[i] + "\n");
}
};
private int count = 0;
public void init() {
Container cp = getContentPane();
t.setEditable(false);
cp.setLayout(new FlowLayout());
// Create Borders for components:
Border brd = BorderFactory.createMatteBorder(1, 1, 2, 2, Color.BLACK);
lst.setBorder(brd);
t.setBorder(brd);
// Add the first four items to the List
for (int i = 0; i < 4; i++)
lItems.addElement(flavors[count++]);
// Add items to the Content Pane for Display
cp.add(t);
cp.add(lst);
cp.add(b);
// Register event listeners
lst.addListSelectionListener(ll);
b.addActionListener(bl);
}
public static void main(String[] args) {
run(new List(), 250, 375);
}
public static void run(JApplet applet, int width, int height) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(applet);
frame.setSize(width, height);
applet.init();
applet.start();
frame.setVisible(true);
}
} ///:~
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