为什么40亿次迭代的Java循环只需要2毫秒?

I'm running the following Java code on a laptop with 2.7 GHz Intel Core i7. I intended to let it measure how long it takes to finish a loop with 2^32 iterations, which I expected to be roughly 1.48 seconds (4/2.7 = 1.48).I'm running the following Java code on a laptop