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Can anyone explain me this 

int i=2;
int j=+-i;//-+i;

the value of j=-2 in either case of +-i or -+i.

Is this fine in Java ? or should this be a compiler error?

Thankx in advance.

asked Dec 7, 2011 at 11:57

4 Answers 4

11

It's fine - you've just got two unary operators together. So it's either:

int j = +(-i);

or

int j = -(+i);

See sections 15.15.3 and 15.15.4 of the JLS for these two operators.

answered Dec 7, 2011 at 11:58
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2

This is absolutely fine. Go through the Unary Operators in java

Both the cases are similar, the ultimate result stays same with the same operations performed in different order!!

answered Dec 7, 2011 at 12:00

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2

just think of it this way: int j = +i would correspond to int j = i. Therefore, -+i or +-i would be -i.

answered Dec 7, 2011 at 12:01

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2

You're applying two unary operators to i:

int j = +-i;

is equivalent to

int j = +(-i);

and similarly for -+i. The outcome is the same as negating i unless i is equal to Integer.MIN_VALUE (in which case j ends up equal to i).

answered Dec 7, 2011 at 12:02

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