CopyOnWriteArrayList is thread-safe variant of ArrayList. New copy of underlying array is created when any add, set (or modification) operations performed on CopyOnWriteArrayList. CopyOnWriteArrayList can be visualize as combination of words, COPY + On Write + ArrayList. New copy of underlying array is created, when any write/update/remove operation is performed on CopyOnWriteArrayList. i.e. When any… Read More »
Elements in TreeSet are ordered using natural order or Comparator/Comparable interface. In case of user defined objects or POJO, POJO needs to implement Comparable interface to sort objects. TreeSet will invoke the compareTo method of POJO, to sort POJOs (contained in TreeSet) We have already discussed to sort user defined objects using Comparator interface. Example – Sort Car POJO… Read More »
What is TreeSet? TreeSet is a NavigableSet implementation based on a TreeMap. Elements in TreeSet are ordered using natural order or Comparator/Comparable interface. In case of user defined objects or POJO, we need to supply the Compartor (to specify on which fields, we would like to sort objects) Comparator is specified during construction of TreeSet.… Read More »
1. What is TreeSet colletion in java ? Elements in TreeSet are ordered using natural order or Comparator provided. e.g. TreeSet containing integers will be sorted in natural order e.g TreeSet containing user defined objects will be sorted using comparator supplied. TreeSet is a NavigableSet implementation based on a TreeMap. TreeSet is red black tree… Read More »
Hashtable and linked list implementation of the Set interface, with predictable iteration order. LinkedHashSet maintains the Insertion order of elements using LinkedList LinkedHashSet is UnSynchronized and not thread safe. Given a LinkedHashSet containing String objects in java. Set<String> computerGenerations = new LinkedHashSet<>() We would like to convert LinkedHashSet to Array of Strings in java. We… Read More »
LinkedHashSet is Hashtable & linked list implementation of the Set interface, with predictable iteration order. LinkedHashSet maintains the Insertion order of elements using LinkedList LinkedHashSet is UnSynchronized and not thread safe. Iterator of LinkedHashSet is fail-fast. Iterator will throw ConcurrentModificationException, if LinkedHashSet modified at any time after the iterator is created, in any way except through the… Read More »
Hashtable and linked list implementation of the Set interface, with predictable iteration order. LinkedHashSet maintains the Insertion order of elements using LinkedList LinkedHashSet is UnSynchronized and not thread safe. Iterator of LinkedHashSet is fail-fast. Iterator will throw ConcurrentModificationException, if LinkedHashSet modified at any time after the iterator is created, in any way except through the iterator’s own… Read More »