Java Collections Articles | Backend Study Lab

Java Jul 1, 2026 5 min read

Java equals and hashCode Explained

Learn Java equals and hashCode contracts, why they matter for HashMap and HashSet, common mistakes, records, mutability, and testing.

Java Jun 30, 2026 4 min read

Compare HashSet and TreeSet in Java by ordering, uniqueness, contains performance, null handling, memory cost, and practical backend use cases.

Java Jun 30, 2026 4 min read

Compare Queue and Deque in Java, including FIFO queues, double-ended operations, ArrayDeque, LinkedList, stack usage, and practical backend defaults.

Java Jun 30, 2026 4 min read

Compare TreeMap and HashMap in Java by key ordering, lookup complexity, range queries, null handling, memory overhead, and backend use cases.

Java Jan 14, 2026 4 min read

Learn how Java PriorityQueue works, when to use it, how ordering is defined, and common pitfalls around iteration and custom comparators.

Java Jan 8, 2026 4 min read

Compare HashMap and Hashtable in Java, including synchronization, null keys, performance, legacy status, and modern alternatives.