ToDoApp.java

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class ToDoApp {
    public static void main(String[] args) {
        // Frame
        JFrame frame = new JFrame("To-Do List");
        frame.setSize(400, 400);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new BorderLayout());

        // Components
        DefaultListModel<String> taskListModel = new DefaultListModel<>();
        JList<String> taskList = new JList<>(taskListModel);
        JScrollPane scrollPane = new JScrollPane(taskList);

        JTextField taskField = new JTextField();
        JButton addButton = new JButton("Add Task");
        JButton deleteButton = new JButton("Delete Task");

        // Panel for input & buttons
        JPanel inputPanel = new JPanel();
        inputPanel.setLayout(new BorderLayout());
        inputPanel.add(taskField, BorderLayout.CENTER);

        JPanel buttonPanel = new JPanel();
        buttonPanel.add(addButton);
        buttonPanel.add(deleteButton);

        // Add components to frame
        frame.add(scrollPane, BorderLayout.CENTER);
        frame.add(inputPanel, BorderLayout.NORTH);
        frame.add(buttonPanel, BorderLayout.SOUTH);

        
        addButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String task = taskField.getText().trim();
                if (!task.isEmpty()) {
                    taskListModel.addElement(task);
                    taskField.setText("");
                } else {
                    JOptionPane.showMessageDialog(frame, "Please enter a task!");
                }
            }
        });


        deleteButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                int selectedIndex = taskList.getSelectedIndex();
                if (selectedIndex != -1) {
                    taskListModel.remove(selectedIndex);
                } else {
                    JOptionPane.showMessageDialog(frame, "Please select a task to delete!");
                }
            }
        });

        // Show Frame
        frame.setVisible(true);
    }
}