Always use an int data type as the loop index variable whenever possible because it is efficient when compared to using byte or short data types. because when we use byte or short data type as the loop index variable they involve implicit type cast to int data type.
When using arrays it is always efficient to copy arrays using System.arraycopy() than using a loop.
Always avoid anything that can be done outside of the loop like method calls, assigning values to variables, or testing for conditions.
Method calls are very costly and you only make it worse by putting them in a loop. So as far as possible avoid method calls in a loop.
It is better to avoid accessing array elements in a loop the better option would be to use a temporary variables inside the loop and modify the array values out of the loop. It is fast to use a variable in a loop than accessing an array element.
Try to compare the terminating condition with zero if you use non-JIT or HotSpot virtual machine, here is an example to prove the point. JIT or HotSpot virtual machines are optimized for general loops so you do not have to bother about the terminating condition.
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