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Is List:ArrayList::Map:HashMap ?

And if not, what are the differences in how these relate to each other?

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Is this a homework question? – Robin Green May 4 '11 at 18:50
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Do you understand what a Map/List is? stackoverflow.com/questions/2395814/… – josh.trow May 4 '11 at 18:52
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closed as not a real question by Brian Roach, Isaac Truett, Mat, ColinD, Jeremy Heiler May 4 '11 at 19:02

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.

5 Answers

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I believe an ArrayList implements the List interface and is a collection of objects which you can access using an index just like an 'array'.

HashMap implements the Map interface and maps keys to values just like a 'hashtable'.

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up vote 1 down vote

Yes. Just as an ArrayList is an implementation of the List interface, similarly, HashMap is an implementation of the Map interface.

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up vote 5 down vote

If you're asking whether or not HashMap implements the Map interface, like ArrayList implements the List interface, then yes.

public class ArrayList<E>
extends AbstractList<E>
implements List<E>, RandomAccess, Cloneable, Serializable

public class HashMap
extends AbstractMap
implements Map, Cloneable, Serializable
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up vote 2 down vote

Yes. An ArrayList is a concrete implementation of a List, and a HashMap is a concrete implementation of a Map.

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up vote 2 down vote

List and Map are interfaces their implementations are ArrayList and HashMap

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