异或（^）的作用

            //求出其中无法成对的数    int[] array = {1, 2, 5, 2, 5, 1, 4};      int single = array[0];      for(int i = 1; i < array.length; i++)             single ^= array[i];                 System.out.println("single:"+single);

          //交换两个数    int e=1;    int f=3;    e = e^f;    f= f^e;    e=e^f;        System.out.println("e="+e+"f="+f);

a = a ^ b;

b = b ^ a;

a = a ^ b;

祥解：

1

2

3

a1=a^b

b=a1^b

a=a1^b =a1^(a1^b)=a1^a1^b=b