What is the difference between checked and unchecked exceptions?
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In Java, exceptions are categorized into checked and unchecked based on how the compiler enforces exception handling.
✅ Checked Exceptions:
These are exceptions that the compiler checks at compile-time.
If a method throws a checked exception, it must either handle it using a try-catch block or declare it using the throws keyword.
These are typically used for recoverable conditions, like file not found, database connection failure, etc.
Examples:
IOException
SQLException
FileNotFoundException
Example Code:
try {
FileReader file = new FileReader("data.txt");
} catch (IOException e) {
e.printStackTrace();
}
❌ Unchecked Exceptions:
These are not checked at compile-time.
They occur due to programming errors like logical mistakes or improper use of API.
These extend RuntimeException.
Examples:
NullPointerException
ArrayIndexOutOfBoundsException
ArithmeticException
Example Code:
int a = 5 / 0; // ArithmeticException
🔍 Key Differences:
Feature Checked Exception Unchecked Exception
Checked atCompile Time Yes No
Must Handle Yes No
Inherits From Exception RuntimeException
Type of Error Recoverable Programming bug
Conclusion:
Use checked exceptions for conditions you expect and can recover from. Use unchecked exceptions for bugs that should be fixed in code. Proper understanding of both helps write robust and maintainable Java applications.
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