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Performance of Arrays.asList

原文 2009-10-12 04:54:42 6 1 java/ performance/ optimization

What is the cost of using Arrays.asList to convert static object arrays? Assuming that the object array has N items is it just an O(N) algorithm, where all of the items are copied by reference or is it merely a facade where the original array is put behind a List facade?

1 answers

It is cheap, O(1). As you suspect the list is merely a wrapper around the array. This is confirmed by the Java API documentation :

Returns a fixed-size list backed by the specified array. (Changes to the returned list "write through" to the array.)

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Performance of Arrays.asList

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solution1 40 ACCPTED 2009-10-12 04:59:08

solution1
40 ACCPTED 2009-10-12 04:59:08