Learning Path
6 Lessons
1
Tutorial
String Basics & Immutability
Understanding String as a reference type. Why Strings are immutable and what happens when you "modify" a String.
2
Tutorial
String Interning & String Pool
How Java saves memory using String interning. Understanding the String Pool and the difference between literal and new String().
3
Tutorial
String Methods & Operations
Essential String methods: concatenation, substring, comparison, searching, and converting between String and char arrays.
4
Tutorial
StringBuilder & StringBuffer
Mutable alternatives to String. Understanding thread safety, when to use each, and performance comparison.
6
Tutorial
Regular Expressions
Powerful pattern matching for strings. Learn metacharacters, character classes, predefined patterns (\d, \w, \s), and practical uses with replaceAll(), split(), and password validation.
5
Exercises
String Exercises
Practice questions on immutability, String Pool, interning, and choosing between String, StringBuilder, and StringBuffer.
📚 Key Concepts You'll Learn
Immutability
String content cannot be changed once created. New objects are created instead.
String Pool
A special memory area where Java stores unique String literals for reuse.
String Interning
Process of storing only one copy of each distinct String value to save memory.
String Methods
Essential operations: length, charAt, substring, concat, equals, and more.
StringBuilder
Mutable, fast string manipulation for single-threaded applications.
StringBuffer
Thread-safe mutable strings for multi-threaded environments.
Regular Expressions
Pattern matching with \d, \w, \s and character classes. Used with matches(), replaceAll(), and split().