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Java - try-with-resourcesJava - Multiple catch BlocksJava - finally BlockJava - throw and throwsJava - Built-in Exceptions

Java - finally Block

📌 What You Will Learn
  • What an exception is and why programs crash
  • The try, catch, finally structure
  • Checked vs unchecked exceptions (with the updated rule)
  • throw vs throws
  • Creating your own (custom) exceptions
  • try-with-resources — the modern way

finally Block is a core concept of the Java language. This lesson explains The try-catch-finally Structure with complete, runnable code examples, clear step-by-step explanations, and common mistakes to avoid with exam-style MCQs at the end.

The try-catch-finally Structure

Example01
JCode Cell
1try {
2 // risky code that may throw an exception
3} catch (ExceptionType e) {
4 // code to handle that exception
5} finally {
6 // always runs: with or without exception
7}
📝 Key Takeaways
  • Exception = a run-time problem that stops the program; handling prevents the crash.
  • try keeps risky code, catch handles the problem, finally always runs.
  • Checked exceptions must be handled; unchecked (RuntimeException) are optional to handle.
  • throw throws an exception; throws warns that a method may throw one.
  • Custom exceptions extend Exception or RuntimeException for business rules.
  • try-with-resources (Java 7+) closes files/connections automatically.
  • Errors (like OutOfMemoryError) are system problems — not meant to be caught.

🧠 Test Your Knowledge

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