Java Utililty Methods Map to List

final int lastIndex = map.lastKey().intValue();
final int capacity = lastIndex + 1;
final List<List<T>> list = new ArrayList<>(capacity);
for (int i = 0; i < capacity; i++) {
    list.add(new ArrayList<T>());
for (Map.Entry<Integer, List<T>> entry : map.entrySet()) {
    list.set(entry.getKey().intValue(), entry.getValue());
...

List<K> fields = new ArrayList<K>();
List<V> values = new ArrayList<V>();
Set<Entry<K, V>> set = map.entrySet();
Iterator<Entry<K, V>> iter = set.iterator();
while (iter.hasNext()) {
    Entry<K, V> entry = (Entry<K, V>) iter.next();
    fields.add((K) entry.getKey());
    values.add(entry.getValue());
...

List<T> list = new ArrayList<T>();
for (Object key : map.keySet()) {
    list.add((T) map.get(key));
return list;