Question

Is there any equalent for PHP’s usort function in Java? Some library or anything. Thanks.

I guess it could be programmable through some iterfaces, so if you know about something i’d be glad.

Answer 1

You can use java.util.Arrays.sort(T[] a, Comparator<? super T> c).
You’d have to implement the Comparator, which would be equivalent to implementing the function you pass to PHP’s usort.

A silly example of an implementation of the comparator (for Strings):

public class MySillyExampleClass implements Comparator<String> {
    public int compare(String s1, String s2) {      
        return s1.length()-s2.length();
    }
}