Arrays.asList() implementation in java

Question

In Arrays.java file. The method asList is defined as below.

 @SafeVarargs
    public static <T> List<T> asList(T... arr) {
        return new ArrayList<>(arr);
    }

Here the ArrayList constructor is invoked with an Array.(arr), new ArrayList(arr). But there is no constructor in ArrayList class which accepts Array as argument.Array class is in Collections FrameWork but doesn't implement Collection interface. The constructors in ArrayList are

ArrayList()

ArrayList(Collection<? extends E> c)

ArrayList(int initialCapacity)

can someone explain what is happening there?

Alexis C. · Accepted Answer · 2014-02-13 13:10:49Z

12

It uses the constructor ArrayList(E[] array) of the private static class ArrayList<E>, which is present in the Arrays.java file.

answered Feb 13, 2014 at 13:10

Alexis C.

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1 Comment

user2112247 Over a year ago

...and it was located immediately after the asList method!!! Just for the history

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