java/W8/Pair.java

package com.example.crawler;
public class Pair<K, V> {
    private K key;
    private V value;
    public Pair(K key, V value) {
        this.key = key;
        this.value = value;
    }
    public K getKey() {
        return key;
    }
    public void setKey(K key) {
        this.key = key;
    }
    public V getValue() {
        return value;
    }
    public void setValue(V value) {
        this.value = value;
    }
    public static <K, V> Pair<V, K> swap(Pair<K, V> pair) {
        return new Pair<>(pair.getValue(), pair.getKey());
    }
    @Override
    public String toString() {
        return "Pair{" +
                "key=" + key +
                ", value=" + value +
                '}';
    }
}