Java Exception Handling and File IO Stream Quiz
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Questions and Answers

What does the 'try' keyword specify in Java?

  • A block that must be followed by either catch or finally
  • A block used to handle the exception
  • A block where exception code should be placed (correct)
  • A block used to explicitly throw an exception

    • When does the 'finally' block in Java get executed?

  • It is never executed
  • Only when an exception is handled
  • Only when an exception is not handled
  • Whether an exception is handled or not (correct)

    • What is the purpose of the 'throw' keyword in Java?

  • To handle the exception
  • To explicitly throw an exception (correct)
  • To declare exceptions
  • To specify a block where exception code should be placed

    • When does an ArrayIndexOutOfBoundsException occur in Java?

    <p>When inserting a value in the wrong index</p> Signup and view all the answers

    What is recommended regarding the code within a Java 'try' block?

    <p>It should contain code that might throw an exception</p> Signup and view all the answers

    What is an exception in Java?

    <p>An error that occurs during the execution of a program</p> Signup and view all the answers

    How does Java handle exceptions?

    <p>By diverting control to special program blocks called exception handlers</p> Signup and view all the answers

    What causes an ArithmeticException in Java?

    <p>Dividing any number by zero</p> Signup and view all the answers

    When does a NullPointerException occur in Java?

    <p>Using a null value in a variable</p> Signup and view all the answers

    What may cause a NumberFormatException in Java?

    <p>The wrong formatting of any value</p> Signup and view all the answers

    Study Notes

    Exception Handling in Java

    • The 'try' keyword specifies a block of code to be tested for exceptions.

    Finally Block

    • The 'finally' block in Java gets executed regardless of whether an exception is thrown or not, and is used to perform cleanup code.

    Throw Keyword

    • The 'throw' keyword is used to explicitly throw an exception in Java.

    ArrayIndexOutOfBoundsException

    • An ArrayIndexOutOfBoundsException occurs in Java when an array is accessed with an index that is outside the bounds of the array.

    Try Block Best Practices

    • It is recommended to keep the code within a Java 'try' block as short as possible and only include the code that may throw an exception.

    Exceptions in Java

    • An exception in Java is an event that occurs during the execution of a program, such as runtime errors or unexpected conditions.

    Exception Handling

    • Java handles exceptions through a combination of try, catch, and finally blocks, which allow developers to anticipate and recover from exceptions.

    ArithmeticException

    • An ArithmeticException in Java is caused by invalid arithmetic operations, such as division by zero.

    NullPointerException

    • A NullPointerException occurs in Java when an attempt is made to access or manipulate a null object reference.

    NumberFormatException

    • A NumberFormatException in Java may be caused by attempting to convert a string that does not represent a valid number to a numeric value.

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    Description

    Test your knowledge of exception handling and file IO streams in Java with this quiz. Learn about the powerful mechanisms to handle runtime errors and how to maintain the normal flow of the application.

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