Overview
This section contains Java interview programs focused on:
- Data Structures & Algorithms
- Java 8+ (Streams, Collections, Optional)
- Real-world entity-based problems
Categories
🔹 Arrays
- Two Sum
- Missing Number
- Prefix Sum
- Sliding Window basics
🔹 Strings
- Frequency problems
- Anagrams
- First non-repeating character
🔹 Employee – Department (Java 8)
- Highest salary per department
- Average salary by department
- Top N employees
🔹 Java 8 Streams & Collections
- groupingBy
- flatMap
- Comparator sorting
- Map compute / merge