// Demonstrate JList.
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
/*
<applet code="JListDemo" width=200 height=120>
</applet>
*/
public class JListDemo extends JApplet {
JList jlst;
JLabel jlab;
JScrollPane jscrlp;
// Create an array of cities.
String Cities[] = { "New York", "Chicago", "Houston",
"Denver", "Los Angeles", "Seattle",
"London", "Paris", "New Delhi",
"Hong Kong", "Tokyo", "Sydney" };
public void init() {
try {
SwingUtilities.invokeAndWait(
new Runnable() {
public void run() {
makeGUI();
}
}
);
} catch (Exception exc) {
System.out.println("Can't create because of " + exc);
}
}
private void makeGUI() {
// Change to flow layout.
setLayout(new FlowLayout());
// Create a JList.
jlst = new JList(Cities);
// Set the list selection mode to single selection.
jlst.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
// Add the list to a scroll pane.
jscrlp = new JScrollPane(jlst);
// Set the preferred size of the scroll pane.
jscrlp.setPreferredSize(new Dimension(120, 90));
// Make a label that displays the selection.
jlab = new JLabel("Choose a City");
// Add selection listener for the list.
jlst.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent le) {
// Get the index of the changed item.
int idx = jlst.getSelectedIndex();
// Display selection, if item was selected.
if(idx != -1)
jlab.setText("Current selection: " + Cities[idx]);
else // Otherwise, reprompt.
jlab.setText("Choose a City");
}
});
// Add the list and label to the content pane.
add(jscrlp);
add(jlab);
}
}