does += (in general - all shorthand operators) imply an implicit cast?

[Aakash Goel]

What is wrong with...

char c = 'a';
c=c+4;

considering that

char c='a';
c+=4;

works fine!!

Thanks in advance!

[Tom Kowalski]

It`s because, those expressions are similar but not exactly this same. When you use ‘+=’ java will cast the expression automatically so when you write:

c+=5

The compiler will see something like this:

c=(char)(c+5) // not: c = c+5 

P.S I suggest you K&B book, you will find there many answers which will appear for sure, while you are learning for SCJP ^^

[Paolo Dina]

Just to reply to the question in the subject, YES. Quote from JLS.

A compound assignment expression of the form E1 op= E2 is equivalent to E1 = (T)((E1) op (E2)), where T is the type of E1, except that E1 is evaluated only once.

[Aakash Goel]

just wanted to confirm that implicit cast is implied. thanks everyone