#Java performance Tip: When need to copy items from one array to anoyther one, don't use loops. Use the more efficient Arrays.copyOf or System.arraycopy method instead.
Performance test details in 🧵👇
Performance test details in 🧵👇
Given:
☕ int[] arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30};
❌ int[] arr2 = new int[30];
for (int i = 0; i < arr.length; i++) {
arr2[i] = arr[i];
}
☕ int[] arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30};
❌ int[] arr2 = new int[30];
for (int i = 0; i < arr.length; i++) {
arr2[i] = arr[i];
}
✅ int[] arr2 = new int[30];
System.arraycopy(arr, 0, arr2, 0, arr.length);
~25% faster ⚡
System.arraycopy(arr, 0, arr2, 0, arr.length);
~25% faster ⚡
✅ int[] arr2 = Arrays.copyOf(state.arr, state.arr.length);
~35% faster ⚡
~35% faster ⚡
As usual all code for my Benchmarks you can find in my GitHub: github.com/xp-vit/java-lo…
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