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Strings

9 Topics
1

String Basics

Deconstruct String creation (literals vs new objects) and the internal Compact Strings representation in modern Java.

Compares heap allocations vs String Pool registrations, char[] vs Compact Strings byte[] memory usage, and UTF-16 coder checks.
2

String Methods

Explore core string manipulation APIs (substrings, replacements, splits, strips) and performance implications.

Focuses on substring memory references, strip() vs trim(), regex overheads in split(), and loop concatenations.
3

String Comparison

Master identity vs value equality check protocols and lexicographical character order evaluations.

Focuses on == vs equals() checks, comparison boundaries, compareTo() sign values, and equalsIgnoreCase() overheads.
4

String Immutability

Deep dive into the architecture and security reasons behind String immutability in Java.

Focuses on security implications (classloading, database connection urls), thread safety guarantees, and hashcode caching.
5

String Pool

Understand Metaspace memory allocations, interned string caching, and String Pool garbage collection.

Tests String.intern() allocations, pool locations across Java versions, and garbage collection behavior of interned entries.
6

StringBuilder

Examine StringBuilder architecture, dynamic array resizing, buffer allocation profiles, and optimal usage patterns.

Tests capacity growth calculations, internal buffer copies, and non-thread-safe performance profiles.
7

StringBuffer

Explore StringBuffer's thread-safe design, synchronized method overheads, and comparison with StringBuilder.

Focuses on method synchronizations, thread safety guarantees, and stack-allocation thread lock escape optimizations.
8

StringTokenizer

Deconstruct the legacy StringTokenizer utility, comparing it with String.split and regular expression parsers.

Tests character-matching tokenization efficiency, legacy API deprecation status, and compatibility limits.
9

Regular Expressions

Master the Java Regular Expressions engine, compiling patterns, matcher states, and avoiding backtracking failures.

Tests Pattern compiling overheads, Matcher state machine methods, and Catastrophic Backtracking prevention.
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