对否？为什么输出不对提交可以通过？

public class HelloWorld{

    public static void main(String[] args) {

   int one = 10 ;

        int two = 20 ;

        int three = 0 ;

        three = one + two ==>30;

        three += one ==> 40;

        three -= one ==> 30;

        three *= one ==> 300;

        three /= one ==> 30;

        three %= one ==> 0;

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

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

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

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

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

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

        为什么输出不对呢
       error: illegal start of expression
three = one + two ==>30;
^
error: illegal start of expression
three += one ==> 40;
^
error: illegal start of expression
three -= one ==> 30;
^
error: illegal start of expression
three *= one ==> 300;
^
error: illegal start of expression
three /= one ==> 30;
^
error: illegal start of expression
three %= one ==> 0;
^
6 errors