Java MCQs with answers Page - 27

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Q. In Java Inheritance

  • (A) all fields of a class are private
  • (B) all fields of a class are protected
  • (C) a new class is derived from an existing class
  • (D) none of these above

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Q. What happens in a method if there is an exception thrown in a try block but there is no catch block following the try block?

  • (A) The program ignores the exception.
  • (B) The program will not compile without a complete try/catch structure.
  • (C) The program terminates immediately.
  • (D) The program throws an exception and proceeds to execute the finally block.

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Q. The class RuntimeException is the superclass of which of the following classes?

  • (A) NullPointerException
  • (B) NoSuchMethodException
  • (C) IllegalAccessException
  • (D) NoSuchFileException

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Q. How many finally blocks can there be in a try/catch structure?

  • (A) There must be 1.
  • (B) There can be 1 following each catch block
  • (C) There can be 0 or 1 following the last catch block.
  • (D) There is no limit to the number of finally blocks following the last catch block.

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Q. Which of the following statements is NOT true about creating your own exceptions?

  • (A) Typically, constructors are the only methods that you include when you define your own exception class.
  • (B) The exception class that you define extends either the class Throwable or one of its subclasses.
  • (C) If you have created an exception class, you can define other exception classes extending the definition of the exception class you creat
  • (D) None of the above

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Q. What can a method do with a checked exception?

  • (A) Check the exception or ignore it.
  • (B) Return the exception to the sender or handle it in a catch block.
  • (C) Throw the exception to the method that called this method, or handle the exception in a catch block.
  • (D) Handle the exception in the try block or handle the exception in the catch block.

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Q. Which of the following is an exception thrown by the methods of the class String?

  • (A) NullPointerException
  • (B) FileNotFoundException
  • (C) NoSuchElementsException
  • (D) NumberFormatException

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Q. Which of the following statements is true?

  • (A) The class Exception, which is derived from the class Object, is the superclass of the class Throwable.
  • (B) The class Throwable, which is derived from the class Exception, is the superclass of the class Object.
  • (C) The class Throwable, which is derived from the class Object, is the superclass of the class Exception.
  • (D) None of these

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Q. A message string is returned by which method of an Exception object?

  • (A) printMessage()
  • (B) getMessage()
  • (C) printStackTrace()
  • (D) traceMessage()

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Q. When is a finally {} block executed?

  • (A) Only when an exception is thrown by a try block
  • (B) Only when there are no exceptions thrown
  • (C) At the end of a program
  • (D) Always after the execution of a try block, regardless of whether or not an exception is thrown

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