Is List:ArrayList::Map:HashMap ?
And if not, what are the differences in how these relate to each other?
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1Do you understand what a Map/List is? stackoverflow.com/questions/2395814/…josh.trow– josh.trow2011-05-04 18:52:05 +00:00Commented May 4, 2011 at 18:52
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5 Answers
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
Comments
List and Map are interfaces their implementations are ArrayList and HashMap
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Yes. An ArrayList is a concrete implementation of a List, and a HashMap is a concrete implementation of a Map.
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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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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'.
answered May 4, 2011 at 18:56
Malik Daud Ahmad Khokhar
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