RFR 9: 8138963 : java.lang.Objects new method to default to non-null

Roger Riggs Roger.Riggs at Oracle.com
Tue Oct 6 14:06:57 UTC 2015

Hi Paul,

Hence the question about the method name.
It already documents explicitly that the nullDefault value is returned 
and does not restrict the value.

To be a direct replacement for the current code, it should return the 
2nd value regardless of whether it is null or not.


On 10/6/2015 9:56 AM, Paul Benedict wrote:
> It's quite possible for the second argument to be null. Is that your 
> intention? I am not sure it makes sense, but it's not harmful either. 
> I recommend you can either (1) explicitly document that's a 
> possibility and this method could still return null or (2) prevent it 
> by calling requireNonNull.
> Cheers,
> Paul
> On Tue, Oct 6, 2015 at 8:43 AM, Roger Riggs <Roger.Riggs at oracle.com 
> <mailto:Roger.Riggs at oracle.com>> wrote:
>     Java.lang.Objects contains a number of convenience methods to make
>     it easier to handle references that are null.
>     For example, toString(obj, nullDefault),
>     A new method is proposed to return the reference or a default
>     value if the reference is null.
>        static <T> T nonNull(T obj, T nullDefault);
>     Alternatives to the method name include
>     nonNullOrElse ( using the java.util.Optional name pattern) or
>     nonNullOrDefault
>     Please review and comment.
>     Webrev:
>     http://cr.openjdk.java.net/~rriggs/webrev-object-non-null/
>     <http://cr.openjdk.java.net/%7Erriggs/webrev-object-non-null/>
>     Issue:
>     https://bugs.openjdk.java.net/browse/JDK-8138963
>     Thanks, Roger

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