Checked vs Unchecked Exceptions

Intermediate12 min read•Updated: 2026-10-22

⚖️ Checked vs Unchecked Exceptions in Java

Java is unique among major languages in enforcing Checked Exceptions at compile time.

Property	Checked Exceptions	Unchecked Exceptions (`RuntimeException`)
When Checked	At Compile Time	At Runtime
Subclass Of	`java.lang.Exception` (excluding `RuntimeException`)	`java.lang.RuntimeException`
Compiler Requirement	Mandatory: Must catch with `try-catch` or declare with `throws`	Optional: Compiler does not force handling
Common Examples	`IOException`, `SQLException`, `FileNotFoundException`	`NullPointerException`, `ArithmeticException`, `IllegalArgumentException`
Meaning	Recoverable external failure (e.g., network down, missing file)	Programmer coding defect or invariant violation

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Exception Hierarchy: Throwable, Exception, RuntimeException, and Error	Handling Exceptions with try, catch, and finally Blocks

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Intermediate12 min read•Updated: 2026-10-22

Java is unique among major languages in enforcing Checked Exceptions at compile time.

Property	Checked Exceptions	Unchecked Exceptions (`RuntimeException`)
When Checked	At Compile Time	At Runtime
Subclass Of	`java.lang.Exception` (excluding `RuntimeException`)	`java.lang.RuntimeException`
Compiler Requirement	Mandatory: Must catch with `try-catch` or declare with `throws`	Optional: Compiler does not force handling
Common Examples	`IOException`, `SQLException`, `FileNotFoundException`	`NullPointerException`, `ArithmeticException`, `IllegalArgumentException`
Meaning	Recoverable external failure (e.g., network down, missing file)	Programmer coding defect or invariant violation

Next Lesson

Continue learning with hands-on practice, examples, and exercises in the upcoming topic.

Previous Lesson	Next Lesson
Exception Hierarchy: Throwable, Exception, RuntimeException, and Error	Handling Exceptions with try, catch, and finally Blocks

Test your understanding of this lesson with 1 questions. Each question has one correct answer.