Try–catch block in Java - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of a try–catch block in Java?

A try–catch block is used to handle exceptions (errors) that may occur during program execution, allowing the program to continue running instead of crashing.

beginner

What happens inside the try block?

The try block contains code that might throw an exception. Java runs this code and if an exception occurs, it jumps to the matching catch block.

beginner

What is the role of the catch block?

The catch block catches and handles the exception thrown in the try block. It lets you define what to do when an error happens.

intermediate

Can you have multiple catch blocks after one try block? Why?

Yes, you can have multiple catch blocks to handle different types of exceptions separately, making error handling more specific and clear.

intermediate

What is the purpose of the finally block in try–catch?

The finally block contains code that always runs after the try and catch blocks, whether an exception occurred or not. It's used for cleanup like closing files.

What keyword starts the block where you write code that might cause an exception?

A try

B catch

C throw

D finally

The try block is where you put code that might throw an exception.

Which block handles the exception thrown in the try block?

A try

B throw

C finally

D catch

The catch block catches and handles exceptions.

What happens if an exception is not caught in a try–catch block?

A Program continues normally

B Program crashes or stops

C Exception is ignored

D Exception is logged automatically

If an exception is not caught, the program usually crashes or stops.

Which block always executes after try and catch, regardless of exceptions?

A finally

B catch

C try

D throw

The finally block always runs, useful for cleanup.

Can you have multiple catch blocks for one try block?

A No, only one catch block is allowed

B Yes, but only if exceptions are the same type

C Yes, to handle different exception types

D No, catch blocks are optional

Multiple catch blocks let you handle different exceptions separately.

Explain how a try–catch block works in Java and why it is useful.

Think about what happens when an error occurs in your code.

Describe the purpose of the finally block and give an example of when you might use it.

Consider what you want to happen no matter what, even if an error occurs.