Entry.java
package church.util;

public class Entry<K, V> {
    public final K key;
    public final V value;

    private Entry(K key, V value) {
        this.key   = key;
        this.value = value;
    }

    public static <K, V> Entry<K, V> entry(K key, V value) {
        return new Entry<>(key, value);
    }
}