ContactDemo.java

package bar.baz;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;

public class ContactDemo {
    private static class ContactPanel extends JPanel {
        public ContactPanel(String name) {
            setLayout(new BorderLayout());
            add(new JLabel(name));
            setBorder(BorderFactory.createLineBorder(Color.BLUE));
        }

        @Override
        public Dimension getMaximumSize() {
            return new Dimension(super.getMaximumSize().width, super.getPreferredSize().height);
        }
    }

    private static void showGUI() {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Box contactsPanel = Box.createVerticalBox();
        contactsPanel.add(new ContactPanel("Bob"));
        contactsPanel.add(new ContactPanel("John"));
        contactsPanel.add(new ContactPanel("Melissa"));
        contactsPanel.add(Box.createVerticalGlue());

        JScrollPane scroll = new JScrollPane(contactsPanel, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        f.add(scroll);
        f.pack();
        f.setVisible(true);
    }

    public static void main(String... args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                showGUI();
            }
        });
    }
}