交换a、b的值temp = a; a = b; b = temp;比a = a^b;b = a^b;a = a^b;快

<span style="font-size:14px;">		int a=222;
int b=111;

int size = 1000000000;
int temp=0;
long start = System.nanoTime();

for (int i = 0; i < size; i++) {
temp = a;
a = b;
b = temp;
}
System.out.println("用时ns："+(System.nanoTime()-start));

a=222;
b=111;
start = System.nanoTime();

for (int i = 0; i < size; i++) {
a = a^b;
b = a^b;
a = a^b;
}
System.out.println("用时ns："+(System.nanoTime()-start));</span>