Biology Forums - Study Force

Why doesn't the following code compile correctly?

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ColorCheckBoxWindow extends JFrame
{
  private JCheckBox greenCheckBox;
  private final int WINDOW_WIDTH = 300, WINDOW_HEIGHT = 100;
  public ColorCheckBoxWindow()
  {
    setTitle("Green Check Box");
    setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    greenCheckBox = new JCheckBox("Green");
    greenCheckBox.addItemListener(new CheckBoxListener());
    setLayout(new FlowLayout());
    add(greenCheckBox);
    setVisible(true);
  }
  public void itemStateChanged(ItemEvent e)
  {
    if (e.getSource() == greenCheckBox)
    {
       System.exit(0);
    }
  }
}

A) The itemStateChanged method should be coded in a CheckBoxListener class.
B) greenCheckBox should not be a private member.
C) The button cannot be added to the content pane.
D) ColorCheckBoxWindow is not implementing the correct listener.

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