Can you Change a String in Java? (90% Fail This)🚫#dsa #java #shorts #shortsfeed #shortsvideo #coding

This is the #1 Theory Question asked in Java Interviews! 🎤

If you try to modify a String in Java using `s.concat()`, you might be surprised that the original string DOES NOT change.

In this video, I explain:
👉 What is String Immutability?
👉 Why `s.concat(" World")` creates a NEW object instead of modifying the old one.
👉 The difference between String and StringBuilder.

🧠 Why did Java make Strings Immutable?
1️⃣ Security: Strings are used for Database connections and Passwords.
2️⃣ Thread Safety: Multiple threads can share the same String instance safely.
3️⃣ String Constant Pool: To save memory by caching strings.

✅ Pro Tip: If you need a modifiable string, always use the `StringBuilder` class!

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Видео Can you Change a String in Java? (90% Fail This)🚫#dsa #java #shorts #shortsfeed #shortsvideo #coding канала Chetna Patankar