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 = three+=one;

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

                    three = three-=one;

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

                        three = three*=one; 

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

                            three = three/=one;

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

                                three = three%=one;

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

    }

}

 int one = 10 ;

        int two = 20 ;

        int three = 0;

        three=one+two;(改一下int a=one+two;)

         System.out.println("three = one + two ==>  "+three);(相应的这边对应为a)

        three+=one;（此时设int b=a+one=one+two+one=40，three+=one=0）

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