Java try-catch Blocks

Last Updated: 11 July, 2023

In Java, the try-catch block is used for exception handling. It allows us to catch and handle exceptions that may occur during the execution of the code. The try block encloses the code that may throw an exception, and the catch block is used to catch and handle the exception.

The basic syntax of a try-catch block in Java is as follows:

try { // Code that might throw an exception } catch (ExceptionType1 exception1) { // Handle exception1 } catch (ExceptionType2 exception2) { // Handle exception2 } finally { // Optional block executed regardless of whether an exception occurred or not }

Let's understand each block below:

• try: The try block: This block encloses the code that might throw an exception. If an exception occurs within this block, it's immediately caught by the corresponding catch block.
• catch: catch block: This block follows the try block and is used to catch and handle specific types of exceptions. We can have multiple catch blocks to handle different types of exceptions. Each catch block specifies the exception type it can handle. If an exception of that type is thrown within the try block, the corresponding catch block is executed.
• finally: finally block: This block is optional and follows the catch block(s). It is executed regardless of whether an exception occurred or not. The finally block is commonly used for cleanup operations like closing resources (files, database connections, etc.) that need to be executed irrespective of exceptions.

Here's an example that demonstrates the usage of try-catch block:

public class ExceptionHandlingExample { public static void main(String args[]) { int num1 = 50; int num2 = 0; int output = 0; try { // code that may raise exception output = 100 / 0; } catch (ArithmeticException e) { System.out.println(e); } System.out.println("Output: " + output); } }

Output

java.lang.ArithmeticException: / by zero
Output: 0