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

public class TooltipTextOfList{
	private JScrollPane scrollpane = null;
	JList list;
	JTextField txtItem;
	DefaultListModel model;
	public static void main(String[] args){
		TooltipTextOfList tt = new TooltipTextOfList();
	}

	public TooltipTextOfList(){
		JFrame frame = new JFrame("Tooltip Text for List Item");
		String[] str_list = {"One", "Two", "Three", "Four"};
		model = new DefaultListModel();
		for(int i = 0; i < str_list.length; i++)
			model.addElement(str_list[i]);
		list = new JList(model){
			public String getToolTipText(MouseEvent e) {
				int index = locationToIndex(e.getPoint());
				if (-1 < index) {
					String item = (String)getModel().getElementAt(index);
					return item;
				} else {
					return null;
				}
			}
		};
		txtItem = new JTextField(10);
		JButton button = new JButton("Add");
		button.addActionListener(new MyAction());
		JPanel panel = new JPanel();
		panel.add(txtItem);
		panel.add(button);
		panel.add(list);
		frame.add(panel, BorderLayout.CENTER);
		frame.setSize(400, 400);
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

	public class MyAction extends MouseAdapter implements ActionListener{
		public void actionPerformed(ActionEvent ae){
			String data = txtItem.getText();
			if (data.equals(""))
				JOptionPane.showMessageDialog(null,"Please enter text in the Text Box.");
			else{
				model.addElement(data);
				JOptionPane.showMessageDialog(null,"Item added successfully.");
				txtItem.setText("");
			}
		}
	}
}