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Chapter 4 — Core APIs

Master Java's core APIs: String, StringBuilder, arrays, Arrays utility class, Math API, BigInteger/BigDecimal, and the modern Date-Time API including daylight saving time shifts.

Week 1: Arrays, Strings & Prefix Sums

Master contiguous memory structures in Java, including static arrays and string immutability, and optimize range queries using the Prefix Sum pattern.

Week 16: Tries (Prefix Trees)

Master the Trie data structure for lightning-fast string manipulation. Learn to build Autocomplete systems, handle wildcard searches, and optimize multi-word grid searches in Java.