Java Pair class implementation [closed]

Answer 1

My solution was:

public class Pair extends java.util.AbstractMap.SimpleImmutableEntry {

    public  Pair( F f, S s ) {
        super( f, s );
    }

    public F getFirst() {
        return getKey();
    }

    public S getSecond() {
        return getValue();
    }

    public String toString() {
        return "["+getKey()+","+getValue()+"]";
    }

}

Very simple, with all the benefits of the wrapped AbstractMap.SimpleImmutableEntry class.