Why is “a^=b^=a^=b;” different from “a^=b; b^=a; a^=b;”?

Question

I tried some code to swap two integers in Java without using a 3rd variable, using XOR.

Here are the two swap functions I tried:

package lang.numeric         


        

Answer 1

Second variant is equal to

a=a^(b^(a^b));