java交换2个数值变量的值

使用第三个变量作为中间变量

        int a = 10;
        int b = 20;
        int c;
        c = a;
        a = b;
        b = c;
        System.out.println(a);
        System.out.println(b);

不使用额外变量

        int a = 10;
        int b = 20;
        a = a ^ b;
        b = a ^ b;
        a = a ^ b;
        System.out.println(a);
        System.out.println(b);