请问第六行哪里出问题了?
public class HelloWorld{
public static void main(String[] args) {
int one = 10 ;
int two = 20 ;
int three = 0 ;
three=one+two=30;
System.out.println(three);
three+=one=40;
three-=one=30;
three*=one=300;
three/=one=30;
three%=one=0;
System.out.println(three+=one);
System.out.println(three-=one);
System.out.println(three/=one);
System.out.println(three%=one);