Thread by @xpvit

⚠️#Java performance tip⚠️
Use primitive types instead of wrappers.

Java primitive types:
📍byte
📍short
📍int
📍long
📍float
📍double
📍char
📍boolean

More details and explanation in 🧵👇

To show the difference in performance between primitive and wrapper objects I have created a benchmark which just creates an array of "int" and "Integer" and fills them with an index. Sizes of array: "10", "100", "1000", "10000"

Results: 👇

Array of size 10:
❌ arrayOfWrappers 26.131 ns/op - 2.7x slower
✅ arrayOfPrimitives 9.462 ns/op

Array of size 100:
❌ arrayOfWrappers ns/op - 2.7x slower
✅ arrayOfPrimitives 9.462 ns/op

Array of size 1000:
❌ arrayOfWrappers 26.131 ns/op - 2.7x slower
✅ arrayOfPrimitives 9.462 ns/op

Why primitive is more effective? Reasons:
- int requires 4 bytes, while Integer 16
- Integer is an object and creating objects is expensive
- primitive types reside in stack and fast to access, while objects are stored in heap.

🤓

That's a wrap!

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Code can be found as usually on my GitHub: github.com/xp-vit/java-lo…