Collections Framework Overview

Introduction to Java Collections

Interview Relevant: Critical for interviews
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Java Collections Framework

The Collections Framework provides a unified architecture for storing, manipulating, and accessing groups of objects.

Collection
 ā”œā”€ā”€ List
 ā”œā”€ā”€ Set
 ā””ā”€ā”€ 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