能帮我看一下哪里出问题吗

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.prinln("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 );