Interview homework: Which is better Java ArrayList creation [duplicate]

Question

Possible Duplicate:
Type List vs type ArrayList in Java

Hi I have been asked the following question in an interview:

Which of the following would you choose recommended when and where?

ArrayList<SomeType> a = new ArrayList<SomeType>(); or
List<SomeType> a = new ArrayList<SomeType>();

I dont know much difference if anyone knows kindly please help. Thanks in advance.

bellum · Accepted Answer · 2012-12-03 11:31:12Z

8

Second is better cause you can simply change underlying implementation from ArrayList to LinkedList (or to any proper implementation) by one line code change.

answered Dec 3, 2012 at 11:31

bellum

3,7101 gold badge19 silver badges22 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Jimbali Over a year ago

Yes, unless you need to use any methods that are specific to ArrayList.

Peter Lawrey Over a year ago

In summary, you should code deliberately. Use ArrayList because you are using ArrayList specific method(s) otherwise use the interface List.

Collectives™ on Stack Overflow

Interview homework: Which is better Java ArrayList creation [duplicate]

1 Answer 1

2 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Linked

Related