JavaCaps: Map allows duplicates??!!

Greenhorn

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posted 23 years ago

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in JavaCaps mock test (Title-10): http://www.javacaps.com/scjp_util.html
question #2.Which of the following allows duplicates , and introduces positional indexing.?
[a] Set
[b] Map
[c] Iterator
[d] List
To my surprise, the answer is b?!

As I remember, Map doesnot allow duplicates in the collection, right?
who can help me to clear this?? Many thanks in advance!

Jane Griscti

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Posts: 3141

posted 23 years ago

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Hi Jenny,
You're right. A Map cannot have duplicate keys. Believe the correct answer is 'd' List; which allows duplicates and allows you to specify an object's position within the list.
Check the API when in doubt

Hope that helps.
------------------
Jane Griscti
Sun Certified Programmer for the Java� 2 Platform

Jane Griscti
SCJP, Co-author Mike Meyers' Java 2 Certification Passport

Jenny Hua

Greenhorn

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posted 23 years ago

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Thank you very much, Jane!

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