point.comJava Collections Framework
The Java Collections Framework (JCF) serves as a comprehensive architecture designed for the storage retrieval and manipulation of object groups.
The framework comprises interfaces and class implementations along with algorithms that enable efficient data management.
Java's standard library contains this component which resides in the java.util package.
Key Interfaces
| Interface | Description |
|---|---|
| Collection | Root of the collection hierarchy |
| List | Ordered collection (allows duplicates) |
| Set | Unordered, unique elements |
| Queue | Elements processed in FIFO order |
| Map | Key-value pairs, no duplicate keys |
Collections Implementations
List Implementations
| Class | Description |
|---|---|
| ArrayList | Resizable array |
| LinkedList | Doubly-linked list |
| Vector | Synchronized version of ArrayList |
| Stack | LIFO structure based on Vector |
Set Implementations
| Class | Description |
|---|---|
| HashSet | No duplicates, unordered |
| LinkedHashSet | Maintains insertion order |
| TreeSet | Sorted set |
Queue Implementations
| Class | Description |
|---|---|
| PriorityQueue | Ordered by priority |
| ArrayDeque | Double-ended queue |
Map Implementations
| Class | Description |
|---|---|
| HashMap | Key-value pair, no order |
| LinkedHashMap | Maintains insertion order |
| TreeMap | Sorted map by keys |
| Hashtable | Legacy, thread-safe |
Differences Between Major Interfaces
| Feature | List | Set | Map |
|---|---|---|---|
| Duplicates | Allowed | Not allowed | Keys not allowed |
| Ordering | Maintains order | No order (except LinkedHashSet/TreeSet) | Depends on implementation |
| Index-based access | Yes | No | No |
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