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   | import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JSplitPane;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;
 
public class TodoList extends JFrame {
 
    private JPanel contentPane;
    private JTextField textField;
    private JButton btnAdd;
    private JPanel rightPane;
    private JList list;
    private DefaultListModel<String> model;
 
    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
 
            public void run() {
                try {
                    TodoList frame = new TodoList();
                    frame.setVisible(true);
                }
                catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
 
    /**
     * Create the frame.
     */
    public TodoList() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(new BorderLayout(0, 0));
 
        JSplitPane splitPane = new JSplitPane();
        contentPane.add(splitPane);
 
        JPanel leftPane = new JPanel();
        splitPane.setLeftComponent(leftPane);
 
        textField = new JTextField();
        leftPane.add(textField);
        textField.setColumns(10);
 
        rightPane = new JPanel();
        splitPane.setRightComponent(rightPane);
 
        model = new DefaultListModel<>();
        rightPane.setLayout(new BorderLayout(0, 0));
        list = new JList(model);
        rightPane.add(list);
 
        btnAdd = new JButton("Add");
        leftPane.add(btnAdd);
 
        btnAdd.addActionListener(new ActionListener() {
 
            @Override
            public void actionPerformed(ActionEvent e) {
                if (!textField.getText().isEmpty()) {
                    model.addElement(textField.getText());
                    textField.setText("");
                }
            }
        });
    }
 
} | 
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