Java Articles | Backend Study Lab

Java Jul 1, 2026 5 min read

HashMap Collision Handling Explained

Learn how HashMap collision handling works in Java, including buckets, hashCode, equals, tree bins, load factor, bad keys, and performance.

Java Jul 1, 2026 5 min read

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 May 10, 2026 6 min read

A practical reference for Java collection time complexity, including ArrayList, LinkedList, HashMap, TreeMap, HashSet, and PriorityQueue.

Java Mar 15, 2026 4 min read

A practical explanation of ConcurrentHashMap in Java, including thread safety, atomic methods, iteration behavior, and common mistakes.

Java Mar 8, 2026 4 min read

Learn what HashMap load factor means in Java, how it affects resizing, memory usage, collision risk, and lookup performance.

Java Mar 1, 2026 4 min read

Compare ArrayList and LinkedList in Java by access patterns, insertion cost, memory overhead, and practical backend usage.

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.