Finally block in Java - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of a finally block in Java?

The finally block is used to execute important code such as cleanup actions, regardless of whether an exception was thrown or caught.

beginner

When does the code inside a finally block run?

It runs after the try and catch blocks finish, no matter if an exception occurred or not.

intermediate

Can a finally block run if there is a return statement in the try block?

Yes, the finally block still runs even if the try block has a return statement.

advanced

What happens if an exception is thrown inside a finally block?

If an exception occurs in the finally block, it can override any exception thrown in the try or catch blocks.

beginner

Is a finally block mandatory after a try block?

No, a finally block is optional. Every try block must be followed by at least one catch or finally block.

What is guaranteed by the finally block in Java?

A It always executes after try/catch blocks, even if an exception occurs.

B It only executes if an exception is caught.

C It executes before the try block.

D It executes only if there is no exception.

The finally block always runs after the try and catch blocks, no matter what happens.

If a return statement is in the try block, what happens to the finally block?

A The finally block is skipped.

B The finally block runs before returning.

C The program crashes.

D The finally block runs only if an exception occurs.

Even with a return in try, the finally block runs before the method returns.

Can a finally block be used without a catch block?

A Yes, finally can be used alone with try.

B No, catch is required.

C Only if there is no exception.

D Only in Java 8 and later.

A try block can be followed by a finally block without a catch block.

What happens if an exception is thrown inside a finally block?

A It is ignored.

B It is caught automatically.

C It causes the program to exit immediately.

D It replaces any previous exception.

An exception in finally overrides any exception from try or catch.

Which of these is NOT true about finally blocks?

A They always execute unless the JVM exits.

B They can be used to close resources.

C They can prevent exceptions from propagating.

D They run even if there is a return in try.

Finally blocks do not prevent exceptions; they run after try/catch but exceptions still propagate unless caught.

Explain the role of the finally block in Java exception handling.

Think about what code you want to run no matter what happens in try or catch.

Describe what happens when an exception is thrown inside a finally block.

Consider how exceptions in finally affect the original exception.