import java.awt.Button;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.List;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class ListTest extends Frame implements ActionListener {

    private final List list;
    private final Button button;

    public static void main(String ar[]) {
        Frame f = new ListTest();
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        f.setSize(350, 350);
        f.setVisible(true);
    }

    ListTest() {
        super("ListTest");
        setLayout(new FlowLayout());
        
        button = new Button("List.getPreferredSize()");
        button.addActionListener(this);
        add(button);

        list = new List(5) {
            public Dimension getPreferredSize() {
                Dimension d = super.getPreferredSize();
                System.out.println("List.getPreferredSize = " + d.width + "x"
                        + d.height);
                return d;
            };
        };
        list.add("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
        add(list);
    }

    public void actionPerformed(ActionEvent e) {
        Dimension d = list.getPreferredSize();
        button.setBackground(Color.YELLOW);
        button.setLabel("Width:"  + d.width
                     + " Height:" + d.height);
    }
}