Exception Handling in Java
24 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the purpose of the 'finally' block in Java exception handling?

  • To catch specific types of exceptions.
  • To handle only checked exceptions.
  • To define user-defined exceptions.
  • To execute code regardless of whether an exception occurs. (correct)

    • How does a multi-catch block function in Java?

  • It can only handle checked exceptions.
  • It allows one catch block for all exceptions.
  • It requires multiple catch blocks for each exception.
  • It can handle multiple types of exceptions in a single block. (correct)

    • What does the 'throw' keyword do in Java?

  • It throws an exception explicitly, with a specified message. (correct)
  • It defines a block of code for exception handling.
  • It prevents checked exceptions from occurring.
  • It terminates the program immediately.

    • What type of exception can be thrown using 'throw' in Java?

    <p>Both checked and unchecked exceptions.</p> Signup and view all the answers

    What happens if an exception occurs but is not handled by any catch block?

    <p>The finally block is executed and then execution stops.</p> Signup and view all the answers

    Which of the following best describes a checked exception in Java?

    <p>An exception that the compiler forces you to handle.</p> Signup and view all the answers

    In the context of exceptions, what is an unchecked exception?

    <p>An exception that does not need to be declared or caught.</p> Signup and view all the answers

    What is a common use-case for throwing a custom exception in Java?

    <p>To handle general input validation errors.</p> Signup and view all the answers

    What is the primary purpose of exception handling in Java?

    <p>To allow the program to continue executing after an error</p> Signup and view all the answers

    Which of the following exceptions is considered a checked exception?

    <p>IOException</p> Signup and view all the answers

    Which class serves as the root of the Java Exception hierarchy?

    <p>java.lang.Throwable</p> Signup and view all the answers

    How are unchecked exceptions handled in Java?

    <p>They are handled only at runtime.</p> Signup and view all the answers

    What happens to the subsequent statements when an exception occurs at a particular statement in Java without exception handling?

    <p>None of the statements after it are executed.</p> Signup and view all the answers

    Which of the following is an example of an unchecked exception?

    <p>ArithmeticException</p> Signup and view all the answers

    Where are checked exceptions mainly handled in Java?

    <p>They must be caught or declared in the method signature.</p> Signup and view all the answers

    Which of the following is NOT a part of Java's built-in exception classes?

    <p>MemoryOverflowException</p> Signup and view all the answers

    What must immediately follow a try block in Java?

    <p>catch block or finally block</p> Signup and view all the answers

    What is the purpose of the catch block in Java?

    <p>To handle exceptions that occur in the try block</p> Signup and view all the answers

    Which statement is true about the finally block?

    <p>It executes regardless of whether an exception was thrown or handled</p> Signup and view all the answers

    When should the throw keyword be used?

    <p>To throw an exception explicitly</p> Signup and view all the answers

    Which exception occurs when dividing by zero in Java?

    <p>ArithmeticException</p> Signup and view all the answers

    What happens when an exception occurs in a try block?

    <p>The remaining code in the try block does not execute</p> Signup and view all the answers

    What is the function of the throws keyword in a method signature?

    <p>To specify that the method may throw an exception</p> Signup and view all the answers

    How can multiple exceptions be handled in Java using a single try block?

    <p>By using multiple catch blocks for different exceptions</p> Signup and view all the answers

    Study Notes

    Exception Handling in Java

    • Exception handling is a mechanism for managing runtime errors in Java applications, helping maintain the application's normal flow.
    • An exception is an event that disrupts the normal flow of a program and is typically represented as an object thrown at runtime.
    • Exception handling allows the program to continue execution even after an error occurs, rather than halting abruptly.

    Types of Exceptions

    • Checked Exceptions: Exceptions that must be handled or declared. Examples include IOException and SQLException. These are checked at compile time.
    • Unchecked Exceptions (runtime exceptions): These don't need to be declared and can occur during runtime. Examples include ArithmeticException, NullPointerException. These are checked at runtime.

    Keywords for Exception Handling

    • try: Encloses the code that might throw an exception.
    • catch: Handles the exception if it occurs within the try block. The catch block must immediately follow the try block.
    • finally: Executes code regardless of whether an exception was thrown or handled. This is often used for cleanup. Useful if you want to ensure tasks are completed like closing files, closing connections.
    • throw: Explicitly throws an exception.
    • throws: Used to declare that a method might throw a specified exception.

    Common Exception Scenarios

    • ArithmeticException: Occurs when an arithmetic operation is performed that results in an error, such as dividing a number by zero.
    • ArrayIndexOutOfBoundsException: Occurs when an attempt is made to access an array element beyond its valid index bounds.

    Multi-catch Blocks

    • Allows handling multiple exceptions with a single catch block by putting different exception types within one single block.

    Flowcharts

    • Flowcharts illustrate the execution path in case of exception handling (e.g., try-catch flow).

    Custom Errors/Exceptions

    • Can define custom exception classes and provide specific error messages, aiding in robust error handling.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Exception Handling in Java PDF

    Description

    This quiz covers the fundamentals of exception handling in Java, focusing on managing runtime errors and maintaining application flow. Learn about checked and unchecked exceptions, along with relevant keywords like 'try' and 'catch'.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser