Java Exception Handling Complete Tutorial | try-catch | throw vs throws | Exception Hierarchy

Java Exception Handling Complete Tutorial | try-catch | throw vs throws | Exception Hierarchy | Java Interview Prep

In this video, we cover Exception Handling in Java from scratch, with clear explanations, real code examples, and interview-focused concepts.

This lecture explains why exceptions occur, how Java handles runtime errors, and how developers can safely handle and control program crashes using try-catch, throw, and throws keywords.

If you are preparing for Java interviews, learning core Java, or building a strong foundation for backend or Android development, this lecture is mandatory.

🧠 Topics Covered in This Lecture
✅ What is an Exception in Java?

An exception is an unexpected event that disrupts the normal flow of a program during execution.

Example:

Division by zero

Invalid input

File not found

Array index out of bounds

✅ Why Exception Handling is Important?

Prevents program crash

Maintains normal flow

Improves reliability

Helps debug errors

Mandatory for real-world applications

✅ Java Exception Hierarchy (Explained Clearly)

In this lecture, we explain the complete Exception Hierarchy:

Throwable

Error (OutOfMemoryError, StackOverflowError)

Exception

Checked Exceptions (IOException, FileNotFoundException)

Unchecked Exceptions (RuntimeException, ArithmeticException, NullPointerException)

You will clearly understand:
✔ Checked vs Unchecked Exceptions
✔ Which exceptions must be handled
✔ Which exceptions are programmer mistakes

✅ try-catch Block in Java

We explain:

How try block works

How catch block handles exceptions

How control flow moves after an exception

How program continues safely

✅ throw Keyword in Java (Manual Exception)

In this lecture, we explain how to manually raise an exception using throw.


You’ll understand:
✔ When to use throw
✔ Why throw is useful
✔ How custom messages help debugging

✅ throws Keyword in Java

We explain:

Why methods declare throws

How exception responsibility is passed to caller

Difference between handling and declaring exceptions

This is one of the most asked interview questions, explained with a simple divide-by-zero example.

✅ Real Code Examples Explained

ArithmeticException using divide by zero

Manual exception using throw

Method-level exception declaration using throws

Safe program execution without crash

👨‍💻 Who Should Watch This Video?

✔ Java beginners
✔ College students
✔ Interview candidates
✔ Backend developers
✔ Android developers
✔ Anyone confused about exception handling

🎯 Interview Focus

🔥 Frequently asked interview topics covered:

Difference between throw and throws

Checked vs Unchecked exceptions

RuntimeException hierarchy

Exception handling flow

Can we throw runtime exceptions manually?

📚 Java Playlist Context

This lecture is part of a Core Java / Java Interview Preparation playlist, building a strong base before moving to:

Multithreading

Collections

JVM

Backend & Android development

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