交換兩個變量的值的幾種方式

//精簡,一行代碼搞定
int x = 3, y = 7;
System.out.printf("x = %d, y = %d\n", x, y);
x = y + 0 * (y = x);
System.out.printf("x = %d, y = %d\n", x, y);

//兼容,支持Integer.MAXVALUE的+操作
int a = 5, b = 2;
System.out.printf("a = %d, b = %d\n", a, b);
a ^= b;
b ^= a;
a ^= b;
System.out.printf("a = %d, b = %d\n", a, b);
//明了
int p = 4, q = 9;
System.out.printf("p = %d, q = %d\n", p, q);
p = p + q;
q = p - q;
p = p - q;
System.out.printf("p = %d, q = %d\n", p, q);
//⊙﹏⊙b汗,產生中間變量浪費空間,但是大部分人是用這個吧...
int u = 8, v = 6;
System.out.printf("u = %d, v = %d\n", u, v);
int temp = u;
u = v;
v = temp;
System.out.printf("u = %d, v = %d\n", u, v);</pre>
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