what is exception handling in java with example
Exception handling in Java is a mechanism used to handle runtime errors (exceptions) gracefully, allowing the program to recover from unexpected situations without crashing. Java provides a robust exception handling mechanism through the use of
Basic Exception Handling Structure:
Here’s an explanation of the keywords and their roles:
tryBlock: The code that might throw an exception is placed inside the
catchBlock: If an exception occurs within the
tryblock, it is caught and handled in the corresponding
catchblock. The catch block specifies the type of exception it can handle. You can have multiple catch blocks to handle different types of exceptions.
finallyblock contains code that will be executed regardless of whether an exception occurred or not. It is often used for cleanup tasks, such as closing files or releasing resources.
throwkeyword is used to explicitly throw an exception. You can throw either a built-in exception or a custom exception.
throwskeyword is used in method declarations to indicate that the method might throw certain exceptions. It notifies the caller that they need to handle those exceptions.
Example of Exception Handling:
In this example:
tryblock contains code that might throw
catchblocks handle these exceptions and provide appropriate error messages.
finallyblock closes the
Scannerobject, ensuring that it is always closed, even if an exception occurs.
Exception handling helps prevent program crashes due to unexpected situations, making Java programs more robust and reliable.