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check if a field can be set to null

Posted on 2004-10-15
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Last Modified: 2010-03-31

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

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Question by:bcsmess
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6 Comments
 
LVL 14

Assisted Solution

by:Tommy Braas
Tommy Braas earned 525 total points
ID: 12320549
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!

\tt
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LVL 11

Accepted Solution

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cjjclifford earned 525 total points
ID: 12320647
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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Author Comment

by:bcsmess
ID: 12320884
how about final attributes?
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LVL 9

Expert Comment

by:Venci75
ID: 12321059
You will get a compilation error if you try to set a value to a final field.
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LVL 11

Expert Comment

by:cjjclifford
ID: 12321259
as I pointed out...
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LVL 14

Expert Comment

by:Tommy Braas
ID: 12321638
> orangehead911, how about:

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