Question

If arr is an array of size 10, in the following code block, how many times is arr.length accessed?

for (int i = 0; i < arr.length; ++i);

Once? Or every time it loops?

Thanks everyone! Here’s what I ended up doing:

final int len = arr.length;
for (int i = 0; i < len; ++i);

Answer 1

Since you are permitted to change arr within the loop, it’s usually evaluated every time the loop termination condition is evaluated.

An optimising compiler (or JIT) may recognise that you don’t change arr within the loop, and then only evaluate arr.length once.