Module: | Classes, Objects, OOPs & Inheritance
Q46: Consider the following statements regarding the throw keyword:
1. The throw keyword is utilized by the developer to explicitly generate and hand over a custom or built-in exception object to the Java runtime system.
2. The throw keyword can only be utilized to throw exceptions that inherit directly from RuntimeException; throwing checked exceptions manually is strictly prohibited by the compiler.
3. A developer can strategically utilize the throw keyword inside a catch block to re-throw the exact same exception object back to the caller method for further processing.
Which of the above statements is/are correct?
2. The throw keyword can only be utilized to throw exceptions that inherit directly from RuntimeException; throwing checked exceptions manually is strictly prohibited by the compiler.
3. A developer can strategically utilize the throw keyword inside a catch block to re-throw the exact same exception object back to the caller method for further processing.
Which of the above statements is/are correct?
✅ Correct Answer: B
🎯 Quick Answer:
The correct combination is 1 and 3. Statement 2 is incorrect because the throw keyword can be utilized to throw any object that extends Throwable, including both Checked Exceptions and Unchecked Exceptions.While the JVM throws exceptions automatically when it encounters mathematical impossibilities (like division by zero), the throw keyword allows the programmer to enforce business logic boundaries.
Structural Breakdown: The syntax requires the keyword followed by an instantiated object: 'throw new IllegalArgumentException("Age cannot be negative");'. Historical/Related Context: Re-throwing exceptions (Statement 3) is a highly prevalent enterprise pattern.
A low-level database class might catch an SQL error, log the severe details into a private secure file, and then immediately re-throw the exception so the higher-level User Interface class knows to display a generic "Service Unavailable" message to the customer.
Causal Reasoning: The throw instruction fundamentally alters the execution stack.
The millisecond the throw keyword is executed, all subsequent code in that block is instantly bypassed, and the JVM begins aggressively searching backward up the method call stack to find the nearest matching catch block capable of handling the object.