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How to read an input value from a JTextField and add to a JList in Java?
A JList is a subclass of JComponent class that allows the user to choose either a single selection or multiple selections. A JList class itself does not support scrollbar. In order to add scrollbar, we have to use JScrollPane class together with the JList class. The JScrollPane then manages a scrollbar automatically. A DefaultListModel class provides a simple implementation of a list model, which can be used to manage items displayed by a JList control. We can add items or elements to a JList by using addElement() method of DefaultListModel class. We can also add items or elements to a JList by reading an input value from a text field.
Example
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JTextfieldToJListTest extends JFrame {
private DefaultListModel model;
private JList list;
private JTextField jtf;
public JTextfieldToJListTest() {
setTitle("JTextfieldToJList Test");
model = new DefaultListModel();
jtf = new JTextField("Type something and Hit Enter");
jtf.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent me) {
jtf.setText("");
}
});
list = new JList(model);
list.setBackground(Color.lightGray);
jtf.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
model.addElement(jtf.getText());
JOptionPane.showMessageDialog(null, jtf.getText());
jtf.setText("Type something and Hit Enter");
}
});
add(jtf,BorderLayout.NORTH);
add(new JScrollPane(list),BorderLayout.CENTER);
setSize(375, 250);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
public static void main(String[] args) {
new JTextfieldToJListTest();
}
}Output
Updated on: 10-Feb-2020
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