What is the difference between += and =+?

Question

What is the difference between += and =+? Specifically, in java, but in general also.

Answer 1

The += operation as you said, is used for increment by a specific value stated in the R value.Like,

i = i+1;
//is equivalent to 
i += 1;

Whereas, =+ is not any proper operation, its basically 2 different operators equal and unary plus operators written with each other.Infact the + sign after = makes no sense, so try not to use it.It will only result in a hocum.

i =+ 1;
//is equivalent to
i = +(1);

Answer 2

+= is an operator that increments the left-hand side of the assignment by the value of the right-hand side and assigns it back to the variable on the left-hand side. =+ is not an operator but, in fact, two operators: the assignment operator = and the unary plus + (positive) operator which denotes the value on the right-hand side is positive. It's actually redundant because values are positive unless they are negated with unary minus. You should avoid the =+ construct as it's more likely to cause confusion than do any actual good.

Answer 3

+= is get and increment:

a += 5; // adds 5 to the value of a

=+ isn't really a valid identifier on its own, but might show up when you're using the unary + operator:

a =+ 5; // assigns positive five to a