Though, on reflection, (no pun intended), the Objects class *is* in Java 7;
https://docs.oracle.com/javase/7/docs/api/java/util/Objects.html
It makes implement .equals and .hashcode trivial;
Assuming a TestClass with three fields, foo, bar and foobar, you have ...
@Override
public int hashCode() {
return Objects.hash(foo, bar, foobar);
}
and ...
@Override
public boolean equals(final Object o) {
if (!o == instanceof TestClass ) {
return false;
}
final TestClass that = (TestClass) o;
return Objects.equals(this.foo, that.foo) &&
Objects.equals(this.bar, that.bar) && Objects.equals(this.foobar,
that.foobar);
}
On 21 September 2016 at 03:17, Remko Popma <remko.po...@gmail.com> wrote:
> Sorry I was thinking of Long.hashCode(long), but I see now that this was
> introduced in java 1.8...
>
> Sent from my iPhone
>
> On 2016/09/21, at 10:09, Gary Gregory <garydgreg...@gmail.com> wrote:
>
> Where do you see such a method?
>
> Gary
>
> On Tue, Sep 20, 2016 at 4:43 PM, Remko Popma <remko.po...@gmail.com>
> wrote:
>
>> Objects.hashCode(long) does exactly the same, but is certainly easier to
>> read. Go for it!
>>
>> Sent from my iPhone
>>
>> On 2016/09/21, at 5:06, Greg Thomas <greg.d.tho...@gmail.com> wrote:
>>
>> Could you use simply
>>
>> return Objects.hashcode(...)
>>
>> To avoid the maths In the first place ??
>> --
>> Sent from my iPhone
>>
>> On 20 Sep 2016, at 19:53, Gary Gregory <garydgreg...@gmail.com> wrote:
>>
>> I see a Findbugs error in:
>>
>> org.apache.logging.log4j.core.impl.Log4jLogEvent.hashCode()
>>
>> for:
>>
>> result = 31 * result + (threadPriority ^ (threadPriority >>> 32));
>>
>> "The code performs shift of a 32 bit int by a constant amount outside the
>> range -31..31. The effect of this is to use the lower 5 bits of the integer
>> value to decide how much to shift by (e.g., shifting by 40 bits is the same
>> as shifting by 8 bits, and shifting by 32 bits is the same as shifting by
>> zero bits). This probably isn't what was expected, and it is at least
>> confusing."
>>
>> Thoughts?
>>
>> Gary
>>
>> --
>> E-Mail: garydgreg...@gmail.com | ggreg...@apache.org
>> Java Persistence with Hibernate, Second Edition
>> <http://www.manning.com/bauer3/>
>> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/>
>> Spring Batch in Action <http://www.manning.com/templier/>
>> Blog: http://garygregory.wordpress.com
>> Home: http://garygregory.com/
>> Tweet! http://twitter.com/GaryGregory
>>
>>
>
>
> --
> E-Mail: garydgreg...@gmail.com | ggreg...@apache.org
> Java Persistence with Hibernate, Second Edition
> <http://www.manning.com/bauer3/>
> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/>
> Spring Batch in Action <http://www.manning.com/templier/>
> Blog: http://garygregory.wordpress.com
> Home: http://garygregory.com/
> Tweet! http://twitter.com/GaryGregory
>
>
