Custom String Utils (Java)

A custom-built Java String utility library implemented completely from scratch, without using Java’s built-in String helper methods.

This project is designed for learning, interview preparation, and demonstrating low-level string manipulation, algorithmic thinking, and clean code principles.

✨ Features

• Immutable custom String implementation
• Manual character-level processing
• No usage of Java String utility methods
• Rich set of string operations:
  • Searching, replacing, splitting
  • Case transformations (upper, lower, title, camel, snake, kebab)
  • Validation (numeric, alphabetic, alphanumeric)
  • Statistics (word count, vowels, consonants)
  • Palindrome detection
  • Padding, trimming, repeating, truncation

🧠 Design Principles

• Immutable object design
• Separation of concerns
• Clean and readable algorithms
• Zero dependency on Java String utilities

🎯 Purpose

• Deep understanding of how String works internally
• Practice data structures and algorithms
• Build a strong portfolio project for Java backend roles
• Interview-ready demonstration of low-level logic

🚀 Tech Stack

• Java (Core)
• No external libraries
• No built-in String helpers

📌 Example Usage

StringUtils str = new StringUtils("Hello World");

System.out.println(str.toUpperCase());
System.out.println(str.reverse());
System.out.println(str.toCamelCase());
System.out.println(str.isPalindrome());

📂 Project Structure

uz.stringutils
 ├── core
 ├── util
 ├── validation
 ├── converter
 └── demo