How to handle exceptions in Java ?

Exceptions are used in Java to handle errors and unusual situations that may occur during program execution. To handle exceptions these execeptions, you can use a combination of try, catch, and finally blocks.

The try block contains code that may throw an exception so if an exception is thrown, the program executes to insructions in the catch block which contains the code for handling the exception, otherwise the catch block is skipped if no exception is thrown.

Here's an example of a try-catch block:

try {
    // code that might throw an exception
} catch (ExceptionType1 e1) {
    // code to handle ExceptionType1
} catch (ExceptionType2 e2) {
    // code to handle ExceptionType2
} finally {
    // code that will always be executed, regardless of whether an exception is thrown or not
}

In this example, if an exception of type ExceptionType1 is thrown in the try block, the program will jump to the first catch block and execute the code there and if an exception of type ExceptionType2 is thrown, the program will jump to the second catch block and execute the code there. But if no exception is thrown, the program will skip both catch blocks and execute the finally block.

The finally block is optional, but it is useful for cleaning up resources, such as closing files or releasing locks, that were acquired in the try block.

It's important to remember that catch blocks are executed sequentially, so arrange your catch blocks in the order of the most specific to the least specific to be sure that the most specific catch block for the corresponding exception is executed.

This article was originally posted on www.devcorner.blog