Zipping two Lists into a Map (resulting map has O(n) get, mainly used for iterating pairs)

ZippedListMap.java

import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;

public class ZippedListMap<K, V> extends AbstractMap<K, V> implements Map<K, V> {

  private final List<K> keys;
  private final List<V> values;

  public ZippedListMap(List<K> keys, List<V> values) {
    Objects.requireNonNull(keys, "keys");
    Objects.requireNonNull(values, "values");
    if (keys.size() != values.size()) {
      throw new IllegalArgumentException("Expected lists of equal size");
    }
    this.keys = keys;
    this.values = values;
  }

  @Override
  public Set<Entry<K, V>> entrySet() {
    return new AbstractSet<>() {

      @Override
      public Iterator<Entry<K, V>> iterator() {
        Iterator<K> keysIterator = keys.iterator();
        Iterator<V> valuesIterator = values.iterator();

        return new Iterator<>() {

          @Override
          public boolean hasNext() {
            return keysIterator.hasNext();
          }

          @Override
          public Entry<K, V> next() {
            return new SimpleImmutableEntry<>(keysIterator.next(), valuesIterator.next());
          }
        };
      }

      @Override
      public int size() {
        return keys.size();
      }
    };
  }

  public static void main(String... args) {
    var list1 = List.of(1, 2, 3);
    var list2 = List.of(1, 2, 3);

    var map = new ZippedListMap<>(list1, list2);

    // key = 1 value = 1
    // key = 2 value = 2
    // key = 3 value = 3
    map.forEach((k, v) -> System.out.println("key = " + k + " value = " + v));
  }
}