Char into byte? (Java)

How come this happens:

char a = '\uffff'; //Highest value that char can take - 65535
byte b = (byte)a; //Casting a 16-bit value into 8-bit data type...! Isn't data lost here?
char c = (char)b; //Let's get the value back
int d = (int)c;
System.out.println(d); //65535... how?

Basically, I saw that a char is 16-bit. Therefore, if you cast it into a byte, how come no data is lost? (Value is the same after casting into an int)

Thanks in advance for answering this little ignorant question of mine. :P

EDIT: Woah, found out that my original output actually did as expected, but I just updated the code above. Basically, a character is cast into a byte and then cast back into a char, and its original, 2-byte value is retained. How does this happen?