a和b互换的2种方式

int a=3;
        int b=2;

        a=a+b;
        b=a-b;
        a=a-b;

        System.out.println(a);
        System.out.println(b);

int a=3;
        int b=2;

        a=a^b;
        b=b^a;
        a=a^b;

        System.out.println(a);;
        System.out.println(b);