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How can we catch a double click and enter key events for a JList in Java?\n
A JList can extend JComponent class that allows the user to choose either a single or multiple selections. A JList can generate a ListSelectiionListener interface and it includes one abstract method valueChanged(). A JList can also generate a MouseListener interface to catch a double click event in the list and generates a KeyListener interface to catch an enter key event.
Example
import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; import java.util.*; public class JListTest extends JFrame { public JListTest() { setTitle("JList Test"); setLayout(new FlowLayout()); Vector v = new Vector(); for (int i = 1; i < 15; i++) { v.addElement("Item #" + i); } add(new JLabel("Double-clicked on: ")); final JTextField dblTextField = new JTextField(15); add(dblTextField); add(new JLabel("Enter key on: ")); final JTextField entTextField = new JTextField(15); add(entTextField); final JList list = new JList(v); // catch double-click events list.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent me) { if (me.getClickCount() == 2) { dblTextField.setText(""+list.getSelectedValue()); } } }); // catch enter-key events list.addKeyListener(new KeyAdapter() { public void keyReleased(KeyEvent ke) { if(ke.getKeyCode() == KeyEvent.VK_ENTER) { entTextField.setText(""+list.getSelectedValue()); } } }); add(new JScrollPane(list)); setSize(375, 250); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLocationRelativeTo(null); setVisible(true); } public static void main(String[] args) { new JListTest(); } }
Output
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