Re: How to identify the cause of ClassCastException?

Thank you all.

Yes, I printed out "state.getClass().getName()" and it is type State. I
see what my problem is.

I have another related question. Suppose:

public class State
{
    public Map<String, int> map = new Map<String, int>(); //please let
me use "public" here, the reason is to show my question below

    private int numA;

    public State()
    {
        setNumA(99);
    }

    public void setNumA(int a)
    {
        map.put("A", a);
    }

}

public class WarmState extends State
{
    private int numB;

    public WarmState()
    {
        super();
        setNumB(11);
    }

    public void setNumB(int b)
    {
        super.map.put("B", b);
    }

}

With two classes above available, now:

State state = new State();

state.map.put("B", 33);

Can I cast state to type WarmState now?

Thank you.