What is the difference between using collections a...
# feedk
Katarzyna
10/25/2021, 8:18 AMWhat is the difference between using collections and arrays of primitives?
Consider Arrays with primitives for performance-critical processing by @marcinmoskala 👇
https://kt.academy/article/ek-arrays
a
altavir
10/25/2021, 8:28 AMWhile the general point is correct, the statement about the memory is not. The default list implementation - ArrayList uses array under the hood so there is no overhead in memory usage. The problem with performance comes from different source: automatic boxing.
altavir
10/25/2021, 8:29 AMcc @marcinmoskala
altavir
10/25/2021, 8:31 AMOh, I am not quite correct because even Array of Int uses boxing.
altavir
10/25/2021, 8:32 AMIt is possible to do list that uses IntArray though. It will use the same amount of memory but still will be slower.
altavir
10/25/2021, 8:43 AMAs for benchmarks, they strongly depend on JVM being used. Much better on GraalVM for such tasks and could be much worse on Android.
k
Kamil Kalisz
10/25/2021, 8:58 AMAs mentioned in the article in most cases still using of Collections is better choice, But for sure for some performance critical software arrays ma be good choice.
🙂 1
j
jimn
10/25/2021, 10:10 AM(Heap)ByteBuffers, IntBuffers, etc. are also arrays with benefits. particularly ByteBuffers allow for primitive conversions to and from from unaligned bytes.
👍 1
3 Views