我哪里写错了吗
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.prntln("three%=one"==>+three);
}
}