General collection interfaces (Collection, Set, Map, List, Queue, SortedSet, SortedMap)
Interfaces extending Collection. Is Map part of Collection interface
Difference between ArrayList and LinkedList
Difference between Stack and Queue
TreeSet vs TreeMap
Internal structure of HashMap/Hashtable
Requirements for implementation of hashCode to achieve best performance
Definition and ways of resolving collisions in hash tables
Differences between Hashtable and ConcurrentHashMap
Special versions of collections. EnumSet, EnumMap, WeakHaskMap, IdentityHashMap.
Iterator and modification of a List. ConcurentModificationException. Collections with safe iterators (CopyOnWriteArrayList/CopyOnWriteArraySet)