Java is a language that emphasizes robustness, and a significant part of this comes from its exception handling mechanism. Exception handling allows a program to gracefully handle runtime errors, ensuring the application can continue running or terminate gracefully. Are you ready to test your knowledge on Java’s exception handling? Dive into this beginner-friendly quiz!
Each question is followed by the correct answer and an explanation to help reinforce your knowledge.
1. Which keyword is used to manually throw an exception in Java?
Answer:
Explanation:
The throw keyword is used to manually throw an exception in Java.
2. Which of the following is a superclass of all exception classes?
Answer:
Explanation:
The Throwable class is the superclass of all exception and error classes in Java.
3. What does the finally block do?
Answer:
Explanation:
The finally block is used to execute code regardless of whether an exception has occurred or not.
4. Which of these is a checked exception in Java?
Answer:
Explanation:
IOException is a checked exception. Checked exceptions need to be either caught or declared using the throws keyword.
5. How many catch blocks can a try block have?
Answer:
Explanation:
A try block can be followed by multiple catch blocks to handle different types of exceptions.
6. What is the purpose of the throws keyword?
Answer:
Explanation:
The throws keyword is used in the method signature to declare that the method might throw the specified exception, thus propagating it to the caller.
7. Which of these is an unchecked exception?
Answer:
Explanation:
ArrayIndexOutOfBoundsException is an unchecked exception. Unchecked exceptions are subclasses of RuntimeException.
8. Which block must be defined first, a catch block or a finally block?
Answer:
Explanation:
If both catch and finally blocks are present, the catch block must come before the finally block.
9. If a method does not handle a checked exception, what must the method do?
Answer:
Explanation:
If a method does not handle a checked exception, it must declare it using the throws keyword.
10. Which of these is not an exception-handling keyword in Java?
Answer:
Explanation:
exit is not an exception-handling keyword in Java. It is a method (System.exit()) used to exit the program.
I hope this quiz was a valuable tool to gauge and improve your understanding of Java’s exception-handling mechanism. Keep practicing and dive deeper into the world of Java programming!