import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
public class Main {
public static void main(String[] a) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Vector months = new Vector();
JList list = new JList(months);
months.addElement("January");
months.addElement("December");
frame.add(new JScrollPane(list));
frame.setSize(300, 200);
frame.setVisible(true);
}
}