This surprised me:
char c = 'M';
byte b = -1;
c = b; //incompatible types
Why is this a possibly lossy conversion? A byte is 8 bits and size of a char in Java is always 16 bits, so I would expect this to be promotion.
char is unsigned (has a range of 0 to 2^16 - 1), so -1 is not within its range.
byte, on the other hand, is signed, and has a range of -128 to 127. Therefore, even though a b byte is represented by half the bits of a char, not all the possible byte values are also char values.
BTW, char is the only unsigned type is Java, so for other integral types (int,long) this assignment would work.
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