How to use Comparator to sort an String array in Java?

I want sort an array of Strings using Comparator<T> ( I'm well aware of lambdas in Java 8 ) just wanted to test Comparator<T> for exercise and here is my code :

package ehsan;

import java.util.Arrays;
import java.util.Comparator;

public class Test {
    public static void main(String[] args) {
        String[] names = {"Winter","Autumn","Summer","Spring"};
        Arrays.sort(names, new Comparator<String>() {
            @Override
            public int compare(String o1, String o2) {
                if(o1.length()>o2.length())
                    retu 1;
                else if(o1.length()==o2.length())
                    retu 0;
                else
                    retu -1;
            }
        });
        for (String elem:names) {
            System.out.println(elem);
        }
    }
}

But the result I get ain't what I expect :

Winter
Autumn
Summer
Spring

And it seems it doesn't change anything! Well, I guess I am missing something.

Any help would be appreciated :)