check if a field can be set to null


How do you check if a field can be set to null?  Can you write code that throws an exception......

bcsmessAsked:
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Tommy BraasCommented:
Hi bcsmess,

All non-native field types in Java can be set to null. If you have accessors to all variables you can enforce that only non-null values are set.

Cheers!

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cjjcliffordCommented:
orangehead911, how about:

class MyClass {
    private static final String myString = "hello";

    private void setNull() {
        // This is not allowed....
        myString = null;
    }
}

Of course, my example is a compile error... but yes, all non-final attributes can be set to null...
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bcsmessAuthor Commented:
how about final attributes?
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Venci75Commented:
You will get a compilation error if you try to set a value to a final field.
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cjjcliffordCommented:
as I pointed out...
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Tommy BraasCommented:
> orangehead911, how about:

Stating the obvious, final fields aren't variables...they are constants.
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