Frequently Used java APIs'

Important java API’s to remember  :

·         Comparable

·         Comparator

·         List

·         LinkedList

·         ArrayList

·         Vector

·         Set

·         HashSet

·         TreeSet

·         SortedSet

·         Map

·         TreeMap

·         HashMap

·         SortedMap

·         Serializable

·         Clonable

·         Integer,Double,Boolean,Long

·         String

·         Object

·         Thread

·         Runnable interface

·         HttpServlet

·         HttpSession

·         Collections

·         Arrays

·         Generics

·         Java.lang.Math

·         StringBuffer

·         StringBuilder

·         ThreadLocal

·         Iterator

·         Enumerator

·         Date

·         Calendar

·         LinkedHashSet

·         LinkedHashMap

·         PriorityQueue

·         Random

·         Stack<E>

·         WeakHashMap

·         Pattern

·         Matcher