Java OCP 21 (1Z0-830) | Exceptions | Exception Hierarchy — Checked vs Unchecked

Java OCP 21 Exam (1Z0-830) — Exception Handling Series
Video 10 : Exception Hierarchy — Checked vs Unchecked vs Error

In this video you will learn:
✅ Throwable — the root of the entire exception hierarchy
✅ Error — JVM-level problems, do NOT catch
✅ OutOfMemoryError and StackOverflowError explained
✅ Why you should never catch Error
✅ Exception — the branch for application-level problems
✅ RuntimeException — unchecked, compiler does not require handling
✅ NullPointerException — calling method on null reference
✅ ArrayIndexOutOfBoundsException — index negative or gt = length
✅ ClassCastException — invalid cast at runtime
✅ ArithmeticException — integer division by zero
✅ NumberFormatException — parsing invalid String as number
✅ Checked exceptions — compiler forces catch or declare throws
✅ IOException, SQLException, ParseException explained
✅ The catch OR declare throws rule — missing both = compile error
✅ Catch block ordering — most specific first, most general last
✅ Reversed order = compile error — unreachable catch block
✅ Overriding and checked exceptions — cannot declare broader exceptions
✅ getMessage(), getCause(), printStackTrace() — Throwable methods
🎯 OCP 21 Exam Objective:
"Handle exceptions using try/catch/finally, try-with-resources and multi-catch"

📺 Full OCP 21 playlist:
https://www.youtube.com/playlist?list=PLXgr9iga1fVwr0UPtK4bqLINB9qjwr-zq
📝 Practice Questions:
👉 OCA 8 (1Z0-808): https://javalearn.clustermicro.com — Live now
👉 OCP 21 (1Z0-830): https://javaocp.clustermicro.com — Coming Soon
📧 Early access: ab.clustermicro@gmail.com

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#JavaError #RuntimeException #NullPointerException
#IOException #JavaThrowable #JavaExceptions
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