What is the difference between throw and throws keywords?

Introduction: As a registered and experienced Java tutor on UrbanPro.com, I'm here to help you understand the difference between 'throw' and 'throws' keywords in Java. Java Training is crucial for mastering the language, and UrbanPro is the best online platform to find experienced tutors and coaching institutes.

Understanding 'throw' and 'throws' Keywords:

1. 'throw' Keyword: The 'throw' keyword is used for exception handling in Java, primarily for throwing custom exceptions.

• It is followed by an instance of an exception or a subclass of the 'Throwable' class.
• 'throw' is used within the method to throw an exception explicitly when a certain condition is met.
• For example:
  java

• public void customExceptionExample() { if (condition) { throw new CustomException("This is a custom exception message."); } }

2. 'throws' Keyword: The 'throws' keyword is used in method signatures to declare that a method may throw certain exceptions.

• It specifies the exceptions that can be thrown from the method.
• It is used to indicate which exceptions should be handled by the caller of the method.
• For example:
  java

• public void methodWithThrows() throws IOException, CustomException { // Method code }

Key Differences:

1. Usage:

• 'throw' is used within the method body to throw an exception explicitly.
• 'throws' is used in the method declaration to indicate potential exceptions that the method may throw.

2. Syntax:

• 'throw' is followed by an instance of an exception.
• 'throws' is followed by a list of exception classes separated by commas.

3. Role:

• 'throw' is used for actual exception creation and throwing.
• 'throws' is used for exception declaration, specifying what exceptions a method might throw.

4. Handling:

• 'throw' is part of the method's code logic and is used to generate and throw exceptions.
• 'throws' is part of the method signature and informs the caller about potential exceptions.

Conclusion: In Java Training, understanding the difference between 'throw' and 'throws' keywords is essential for effective exception handling. If you are looking for the best online coaching for Java Training, UrbanPro.com is the trusted marketplace to find experienced tutors and coaching institutes to master Java and various other programming concepts.