Java Finally Block

Java finally block

Created By: chatGPT

Java's finally block is used as a mechanism to ensure that a section of code always executes irrespective of whether an exception occurred or not. It is commonly used to perform clean-up activities, like closing file streams or releasing resources. The finally block follows a try block and may be associated with an optional catch block.

try {
    // Code that may throw an exception
    int result = 10 / 0;
} catch (ArithmeticException e) {
    // Handle the exception
    System.out.println("Caught an ArithmeticException: " + e.getMessage());
} finally {
    // This block always executes
    System.out.println("Finally block executed.");
}

In the example above, the code in the try block attempts to execute a division that results in an ArithmeticException due to division by zero. The catch block handles the exception, printing an error message. Regardless of the exception, the message from the finally block will always be shown, confirming that its statements are executed last.

try {
    // Code that may throw an exception
    FileInputStream file = new FileInputStream("file.txt");
} catch (FileNotFoundException e) {
    // Handle the exception
    System.out.println("File not found: " + e.getMessage());
} finally {
    // Clean up resources
    // Assuming 'file' is a resource we may need to close
    if (file != null) {
        try {
            file.close();
        } catch (IOException e) {
            System.out.println("Error closing the file: " + e.getMessage());
        }
    }
    System.out.println("Finally block executed. Resources cleaned up.");
}