Collections Framework Overview
Introduction to Java Collections
Interview Relevant: Critical for interviews
6 min read
Java Collections Framework
The Collections Framework provides a unified architecture for storing, manipulating, and accessing groups of objects.
Collection
├── List
├── Set
└── Queue
Map (separate hierarchy)
Code Examples
Core collection interfaces
java
1
2List<String> list = new ArrayList<>();
3Set<Integer> set = new HashSet<>();
4Map<String, Integer> map = new HashMap<>();
5 Use Cases
- Data storage
- Efficient searching
- Enterprise applications
Common Mistakes to Avoid
- Confusing Collection and Collections
- Using wrong data structure