Get instance of an object from which an ActionListener is called [duplicate]

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I have an ActionListener class and Class with a JCheckBox in 2 separate files. The ActionListener checks if the checkbox is checked and changes the text next to the checkbox and deselects or selects the checkbox appropriately. What I can't figure out is how to get the instance of the checkbox to check if it is selected or not. I tried casting e.getSource to a JCheckBox but the compiler wouldn't allow it.

ActionListener Class:

public MyAL extends ActionListener
{
    public void actionPerformed(ActionEvent e) 
    {
        if (e.getActionCommand() == MyClass.ACT_CMD_!)
        {
            //if (checkbox is selected)
                //set checkbox text to "I'm Not Selected";
                //deselect the checkbox;
            //else
                //set checkbox text to "I'm Selected";
                //select the checkbox;
        }
    }
}

Class that has a JCheckBox:

public class MyClass 
{
    final static ACT_CMD_1 = "CHECK BOX";
    JCheckBox cb; 

    MyClass()
    {
        cb= new JCheckBox("I'm Not Selected");
        cb.addActionCommand(MyClass.ACT_CMD_1);
        cb.addActionListener(new MyAL());
    }
}