Collection utilities I tend to forget how to implement

CollectionUtils.java

<E> List<List<E>> chunk(List<E> list, int size) {
    int length = list.size();
    return IntStream.range(0, (length - 1) / size + 1)
             .mapToObj(i -> list.subList(i *= size, length - size >= i ? i + size : length))
             .collect(Collectors.toList());
}

<T, U> Map<T, U> zip(List<T> first, List<U> second) {
    return IntStream.range(0, Math.min(first.size(), second.size())).boxed()
            .collect(Collectors.toMap(first::get, second::get));
}

record Pair<K, V>(K first, V second) implements Map.Entry<K, V> {
    public K getKey() { return first; }
    public V getValue() { return second; }
    public V setValue(V value) { 
       throw new UnsupportedOperationException();
    }
}