如何在不使用++I的情况下进行预增量？

Question

I don't think that the following:

i += 1

or

i = i + 1

is the same as ++i. Or am I wrong? Is there any way to do pre increment without using ++ operator?

Answer 1

They are the same. Unless for very simple expressions (like a loop condition), it is better to avoid the ++ or -- operators.

Answer 2

I can't add comments so posting related stackoverflow question here:

How do the post increment (i++) and pre increment (++i) operators work in Java?

Answer 3

As Jeremy already commented, i+=1; and i=i+1; are equivalent to ++i or i++ if they standalone lines of code. To achieve pre/post increment you will have to do the increment before/after the line where you want to use the variable as per the case.

eg- for post increment of a variable named i:

//use value of i here
i += 1;

for pre increment:

i += 1;
//use value of i here

In case of a loop, post increment is pretty straight forward:

for(var i=someValue; i<maxValue; i+=1){
//code here
}

For pre increment:

var i = someValue + 1;
for(; i<maxValue; i+=1){
//code here
}