Variable switch with no other variables or temps

Question

I am a first level Java student in college. We have been instructed to write a Java program that promts the user to input three integers to int variables a, b,c and switch them so that a=c b=a and c=b with out using any other variables or temp variables. I know how to do everything except switch the variables without losing one. The only hint that he gave us was that
x^y^y=x also when we print the variables after rotation we must do it as follows:
System.out.println("a =" a "b=" b "c=" c);
I would really appreciate any hints or advise you can give me to help me out with this problem
again I have only been studying programming for a few weeks so my skills are limited.
Thank You

Answer 1

If
a = 2; (0010) and
b = 4; (0100) than
a ^ b = 6 (0110)
try
a = a ^ c; //=a ^ c
b = b ^ c; //=b ^ c
c = c ^ b; //=b
b = b ^ a; //=a ^ b
a = a ^ c ^ b; //=c
b = b ^ c;
to solve your problem. Do not know if it is the shortest way, but it works. :)