Exceptions in Java

From the Java cheat sheet · Exception Handling · verified Jul 2026

try/catch/finally, resources, and custom exceptions.

java

// Quick Reference
try {
    risky();
} catch (IOException e) {
    e.printStackTrace();
} finally {
    cleanup();
}

💡 Checked exceptions (IOException) must be caught or declared with throws.

⚡ try-with-resources auto-closes anything implementing AutoCloseable - no finally needed.

📌 finally always runs - use it for cleanup, but prefer try-with-resources for closing.

🟢 Extend RuntimeException for unchecked custom errors; Exception for checked ones.

exceptionstry-catch