JDK-collections

This repository covers some of the most used collections of the JDK and their features.

Summary:

Collection class	Base class	Interfaces	Duplicates	Ordered	Sorted	Thread-safe
ArrayList	AbstractListAbstractList	List	Yes	Yes	No	No
LinkedList	AbstractSequentialList	List;Deque	Yes	Yes	No	No
Vector	AbstractList	List	Yes	Yes	No	Yes
HashSet	AbstractSet	Set	No	No	No	No
LinkedHashSet	HashSet	Set	No	Yes	No	No
TreeSet	AbstractSet	Set;NavigableSet; SortedSet	No	Yes	Yes	No
HashMap<K, V>	AbstractMap<K, V>	Map	No	No	No	No
LinkedHashMap<K, V>	HashMap<K, V>	Map	No	Yes	No	No
Hashtable<K, V>	Dictionary<K, V>	Map	No	No	No	Yes
TreeMap<K, V>	AbstractMap<K, V>	Map;NavigableMap; SortedMap	No	Yes	Yes	No

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ArrayList
Implementation explaining .add() .get() .remove() .clear() .size() .next() and iteration using Iterator foreach and for.

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LinkedList
Implementation explaining .add() .addFirst() .addLast() .get() .remove() .removeFirst() .removeLast(). .clear() .isEmpty() .size() .next() and Iteration using Iterator foreach and for.

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ArrayList.vs.LinkedList
Execution time comparison between ArrayLists And LinkedLists, performing .add(); .get(); .remove();

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HashMap
Implementation explaining .put() .get() .getKey() .getValue() .removeIf() .clear() .size() and iteration using Iterator and foreach.

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LinkedHashMap
Impelementation explaining .put() .getKey() .getValue() .removeIf() .clear() .size() and iteration using Iterator and foreach.

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Hashtable
Implementation explaining .put() .get() .getKey() .getValue() .clone() .clear() .size() and iteration using Iterator and foreach, Enumeration to display keys .keys() method.

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TreeMap
Impelementation explaining .put() .entrySet() .getKey() .getValue() .size(), iteration using Iterator.

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HashSet
Implementation explaining .add() .clear() .size() contains() methods and iteration using Iterator and foreach.

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LinkedHashSet
Implementation explaining .add() .clear() .size() .isEmpy() methods and iteration using Iterator and foreach.

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TreeSet
Implementation explaining .add() .first() .last() .ceiling(e) .floor(e) .pollFirst() .pollLast() .tailSet(e) .subSet(eFrom , eTo) .higher(e) .lower(e) .clear() .contains() methods and iteration using Iterator and foreach.