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How to display a value when select a JList item in Java?
A JList is a subclass of JComponent class that allows the user to choose either a single or multiple selections of items. A JList can generate a ListSelectiionListener interface and it includes one abstract method valueChanged(). We can display a value when an item is selected from a JList by implementing MouseListener interface or extending MouseAdapter class and call the getClickCount() method with single-click event (getClickCount() == 1) of MouseEvent class.
Example
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class JListItemSeletionTest extends JFrame {
private JList list;
private JScrollPane jsp;
private Vector data;
public JListItemSeletionTest() {
setTitle("JListItemSeletion Test");
list = new JList();
data = new Vector();
data.addElement("India");
data.addElement("Australia");
data.addElement("England");
data.addElement("England");
data.addElement("New Zealand");
data.addElement("South Africa");
list.setListData(data);
list.setSelectedIndex(0);
list.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent me) {
if (me.getClickCount() == 1) {
JList target = (JList)me.getSource();
int index = target.locationToIndex(me.getPoint());
if (index >= 0) {
Object item = target.getModel().getElementAt(index);
JOptionPane.showMessageDialog(null, item.toString());
}
}
}
});
jsp = new JScrollPane(list);
add(jsp, BorderLayout.NORTH);
setSize(400, 275);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
public static void main(String args[]) {
new JListItemSeletionTest();
}
}Output
Updated on: 10-Feb-2020
1K+ Views
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