Exception Java: Navigating the Turbulence of Errors

Introduction

In the realm of programming, errors are unavoidable, and Java, being one of the most widely used languages, provides a powerful error-handling mechanism through exceptions. These exceptional situations can occur during program execution, requiring a systematic approach to handle them smoothly. we will dive into the world of exceptions in Java, resolving their types, syntax, handling strategies, and best practices.

Understanding

• Definition: Exception Handling in Java is one of the powerful mechanism to handle runtime errors so that the normal flow of the application can be maintained.

• Types: There are mainly two types of exceptions: checked and unchecked.

1. Checked Exception: The classes that directly inherit the Throwable class except RuntimeException and Error are known as checked exceptions. Ex. IOException, SQLException, etc.

2. Unchecked Exception: The classes that inherit the RuntimeException are known as unchecked exceptions. Ex. ArithmeticException, NullPointerException, ArrayIndexOutOfBoundsException, etc.

• Exception Handling Mechanism:

1. The try-catch Block

2. Throwing Exceptions

3. The finally Block

Implementation

1. Define the Exception: Create a new Java class that extends either 'Exception' or 'RuntimeException'.

2. Implement Constructor: If you want to provide specific constructors for your custom exception class, define them based on your requirements. Constructors allow you to pass custom messages or other relevant information when throwing the exception.

3. Throw the Exception: To throw your exception at a specific point in your code, use the "throw" keyword.

Java Code

public class UserException extends Exception {

	public UserException(String message) {
		super(message);
	}
}


public class Test {


	public static void main(String args[]) {

		try {

			throw new UserException("This is user exception");
			
		} catch (UserException ue) {
			
			System.out.println("Caught the exception");


			System.out.println(ue.getMessage());
		}
	}
}

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