Java Techies - Solution for All
Java Collections Framework
- The Collection framework, which took shape with the release of
JDK 1.2and was expanded inJDK 1.4 - All java collection interfaces and classes kept in
java.utilpackage. - Classes like ArrayList, Vector,LinkedList, HashSet, TreeSet, LinkedHashSet, HashMap etc. use to add, reterive, remove, find and iterate the objects
Collection Framework Hierarchy
Collection comes in four flavours
- List - List of things, it care about index of the object.
- Set - Unique things, no duplicate allowed
- Map - Things with a unique id(key)
- Queue - Things arranged by the order in which they are to be processed. (java 5/JDK 1.5 onwards)
| List | Set | Map | Queue | Utility |
|---|---|---|---|---|
| ArrayList | HashSet | HashMap | PriorityQueue | Collections |
| Vector | TreeSet | Hashtable | Arrays | |
| LinkedList | LinkedHashSet | TreeMap | ||
| LinkedHashMap |
