asela38 asela38 - 26 days ago 13
Java Question

Lists.newArrayList vs new ArrayList

What is the best construction for creating a

List
of Strings? Is it
Lists.newArrayList()
(from guava) or
new ArrayList()
?

is it just a personal preference?

or is it just Type generic type inference?

or is there any theoretical or practical value in using Lists.newArrayList()?

Answer

The guava builder saves typing the type arguments multiple times. Compare:

List<Foo<Bar, Baz>> list = Lists.newArrayList();
List<Foo<Bar, Baz>> list = new ArrayList<Foo<Bar, Baz>>();

In Java 7 it's a bit obsolete though, because you have the diamond operator:

List<Foo<Bar, Baz>> list = new ArrayList<>();
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