Java Why is char = char^char different from char^= char?

Question

I was solving a problem in leet code and noticed the following code was not allowed in Java,

char c = 's';
c = c^c;

While the following was

char c = 's';
c^=c;

Is there a particular reason? Thanks you.

Answer 1

This is also true for plus or minus. c^c is evaluated as an int so the right hand side is int and can not be assigned into a char. In the ^= case, the right hand side is char, and can be applied onto a char. This is not the most obvious behavior.