错了，估计你要运算的是这个

package wuxin;

public class wuxin {

public static void main(String[] args) {

int one=10;

    int two=20;

int three=0;

three=one+two;

System.out.println("three1:"+three);

three += one;

System.out.println("three2+=one:"+three);

three -= one;

System.out.println("three3-=one:"+three);

three *= one;

System.out.println("three4*=one:"+three);

three /= one;

System.out.println("three5/=one:"+three);

three %= one;

System.out.println("three6%=one:"+three);

}

}

输出结果：

three1:30

three2+=one:40

three3-=one:30

three4*=one:300

three5/=one:30

three6%=one:0

错了好多

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);

}

}