About the i++ and ++i differences between for loops in Java

We should all know that the difference between i++ and ++i is:

++i is to perform i = i +1 and then use the value of I, while i++ is first using the value of I again to perform i = i + 1;

The execution order for the For loop is as follows:

for (A;B;C)

{

D

}

Into the loop execution a;//just enter the time to execute

Executive B; The condition is true to execute D, or jump out for the

Execution D;

Implementation C;

Go back to the 2nd step and start the execution.

Consider the following example:

for (int i = 0; I < 10;i++) {

System.out.println (i);

}

Equivalent:

for (int i = 0; i < 10;) {

System.out.println (i);

i++;

}

2.for (int i = 0; i<10; ++i) {

System.out.println (i);

}

Equivalent: for (int i = 0; I < 10;)

{

System.out.println (i);

++i;

}

In the body of the loop, the i++ and the ++i function the same.

The information printed out is:

0

1

2

3

4

5

6

7

8

9

Printing information proves that i++ and ++i have the same effect.

But there must be some difference, so the cycle time is also printed out.

Number of cycles = 100:

i++ Time is: 5

++i Time is: 3

Number of cycles = 1000:

i++ Time is: 25

++i time is: 21

Number of cycles = 10000:

i++ Time is: 179

++i Time is: 130

Yes, that's the difference between running time. The i++ statement in Java requires a temporary variable to fetch the value before the increment, and ++i does not need it. This causes the system to request a memory space first when using i++, then plug the value into it, and then release it at last. This is a series of operating time.

We can chew on the beginning of this sentence: ++i is the first to execute i = i +1 and then use the value of I, and i++ is first using the value of I and then execute i = i + 1;

One is the first execution and then in the use of the value of I, one is the first use of the value of I to execute, the running time can be imagined. This is the blogger's personal experience, the wrong place to pay attention to the discussion thank you.

About the i++ and ++i differences between for loops in Java