About Question enthuware.ocpjp.v8.2.1725 :

Help and support on OCA OCP Java Programmer Certification Questions
1Z0-808, 1Z0-809, 1Z0-815, 1Z0-816, 1Z0-817

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morpana
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About Question enthuware.ocpjp.v8.2.1725 :

Post by morpana »

Shouldn't the correct answer be compare as in fourth answer, and not compareTo (second answer) as it is now.

admin
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Re: About Question enthuware.ocpjp.v8.2.1725 :

Post by admin »

Why do you think so?
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nieckq
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Re: About Question enthuware.ocpjp.v8.2.1725 :

Post by nieckq »

admin wrote:Why do you think so?
Because, as it even says in the answer, Comparable has the compareTo(T t) method, and the Comparator makes you implement the compare(Obj obj1, Obj obj2) method. In this case because Person does not implement comparable, we want to sort the collection using a Comparator. Hence we use the compare(Obj obj1, Obj2 obj) method and not compareTo(T t).

admin
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Re: About Question enthuware.ocpjp.v8.2.1725 :

Post by admin »

If you look closely, Option 2 does use compare method (and not compareTo) to compare Person objects.

The compareTo method is used to compare only the the dob field inside the implementation of the compare method. This has nothing to do with Comparator. String class implements Comparable and not Comparator.

String class does not have compare method and that is why option 4 is incorrect.
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Wesley
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Re: About Question enthuware.ocpjp.v8.2.1725 :

Post by Wesley »

That one got me too for exactly the same reason. Sneaky sneaky..

d0wnvk@gmail.com
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Re: About Question enthuware.ocpjp.v8.2.1725 :

Post by d0wnvk@gmail.com »

+1 tricky one..

tugrulkarakaya
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Re: About Question enthuware.ocpjp.v8.2.1725 :

Post by tugrulkarakaya »

very tricky. shit...

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