Java Strings Explained | All String Methods with Examples | String Immutability | Core Java | 4

Publicado el: 04 julio 2026
en el canal de: QAWith SJ

Welcome to QAWithSJ! 🚀

In this Core Java tutorial, you'll learn Java Strings from scratch along with the most commonly used String methods, real-time examples, and interview questions.

📚 Topics Covered:

✅ What is a String?
✅ Why String is a Class in Java?
✅ String Declaration & Initialization
✅ String Immutability Explained
✅ String Concatenation (+ and concat())

✅ String Methods with Examples:
• length()
• toUpperCase()
• toLowerCase()
• indexOf()
• charAt()
• contains()
• startsWith()
• endsWith()
• equalsIgnoreCase()
• substring()
• replace()
• split()
• trim()
• concat()

✅ Real-Time Examples
✅ Interview Questions
✅ Best Practices

You'll also learn:

✔ Why Strings are Immutable
✔ Difference between + and concat()
✔ Most Frequently Used String Methods
✔ Practical Coding Examples

This video is perfect for:

✔ Java Beginners
✔ Selenium Automation Engineers
✔ Playwright Automation Engineers
✔ Cypress Automation Engineers
✔ API Automation Engineers
✔ Software Developers
✔ Java Interview Preparation

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📌 Core Java Playlist

✔ Java Data Types & Variables
✔ Type Conversion & Type Casting
✔ Java Operators
✔ Java Strings
✔ Conditional Statements
✔ Loops
✔ Arrays
✔ Methods
✔ OOP Concepts
✔ Exception Handling
✔ Collections

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About QAWithSJ

I'm SJ, a Senior QA Software Engineer sharing practical knowledge on Core Java, Selenium, Playwright, Cypress, API Testing, GitHub, CI/CD, and Automation Frameworks.

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