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

public class List {
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        String[] trees = { "Maple", "Larch", "Spruce", "Balsam" };
        JList treeList = new JList(trees);
        JPanel panel = new JPanel();

        JLabel label = new JLabel("Select a Tree");

        treeList.add(panel);

        JButton button = new JButton("Show Me");
        button.setBounds(10, 150, 230, 30);

        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String data = "";
                if (treeList.getSelectedIndex() != -1) {
                    data = "Trees: " + treeList.getSelectedValue();
                    button.setText(data);
                }
            }
        });

        frame.add(button);
        frame.add(treeList);
        frame.setSize(250, 250);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}