求助急求解答

three=one+two;

        System.out.println("three=one+two==> "+three);

        three+=one;

        System.out.println("three+=one==> "+three);

        three-=one;

        Syetem.out.println("three-=one==> "+three);

        three*=one;

        System.out.println("three*=one==> "+three);

        three/=one;

        System.out.println("three/=one==> "+three);

        three%=one;

        System.out.println("three%=one==> "+three);

        为什么这个不对哪里错了