public class HelloWorld{

    public static void main(String[] args) {

   int one = 10 ;

        int two = 20 ;

        int three = 0 ;

        three=one+two;

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

        three /= one ;

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

        three %= one ;

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

答案就在题目下边：

？不会了怎么办