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 (C)</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 (D)</p> Signup and view all the answers

What is an exception in Java?

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

How does Java handle exceptions?

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

What causes an ArithmeticException in Java?

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

When does a NullPointerException occur in Java?

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

What may cause a NumberFormatException in Java?

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

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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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