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External merge sort algorithm

There is a newer version: 2.0.4.RELEASE

package com.mozafaq.extmergesort;

import java.util.Objects;

/**
 * @author Mozaffar Afaque
 */
public class Pair {
    private K key;
    private V value;

    public Pair(K key, V value) {
        this.key = key;
        this.value = value;
    }

    public K getKey() {
        return key;
    }

    public V getValue() {
        return value;
    }

    @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(key, pair.key) && Objects.equals(value, pair.value);
    }

    @Override
    public int hashCode() {
        return Objects.hash(key, value);
    }

    @Override
    public String toString() {
        return '[' +
                "key=" + key +
                ", value=" + value +
                ']';
    }
}