intermediate~2h
Choosing the Right Collection
A decision-framework topic for picking the correct List, Set, Queue, or Map implementation under real constraints — ordering requirements, concurrency, memory, and access patterns — backed by a full Big-O reference table and worked scenarios.
Learning objectives
- Decide between ArrayList, LinkedList, and ArrayDeque based on access pattern and insertion position
- Decide between HashMap, LinkedHashMap, and TreeMap based on ordering and lookup requirements
- Decide between HashSet, TreeSet, and LinkedHashSet based on uniqueness and ordering needs
- Read and apply a Big-O complexity table across collection implementations instead of guessing performance
- Work through realistic 'which collection' scenarios the way they show up in system design and code review
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Choosing the Right Collection