Ejercicio 5 Repaso Segundo Parcial

[ldicandia]

Buenas, queria saber si estaba bien hecho el ejercicio.

public class DoubleKeyHashMap<K1, K2, V> extends HashMap<Pair<K1, K2>, V> implements DoubleKeyMap<K1, K2, V>  {
    @Override
    public boolean containsKey(K1 firstKey, K2 secondKey) {
        return this.containsKey(new Pair<>(firstKey, secondKey));
    }

    @Override
    public V get(K1 firstKey, K2 secondKey) {
        return this.get(new Pair<>(firstKey, secondKey));
    }

    @Override
    public void put(K1 firstKey, K2 secondKey, V value) {
        this.put(new Pair<>(firstKey, secondKey), value);
    }
}

public class Pair<T1, T2> {
    private final T1 value1;
    private final T2 value2;

    public Pair(T1 value1, T2 value2) {
        this.value1 = value1;
        this.value2 = value2;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Pair<?, ?> pair = (Pair<?, ?>) o;
        return Objects.equals(value1, pair.value1) && Objects.equals(value2, pair.value2);
    }

    @Override
    public int hashCode() {
        return Objects.hash(value1, value2);
    }
}