Java MCQs with answers Page - 10

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Q. The keyword used inside a class to refer to its immediate super class is

  • (A) super
  • (B) parent
  • (C) base
  • (D) none of these

A

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Q. Which of the following is true in the case of abstract class

  • (A) Abstract constructors cannot be created.
  • (B) Abstract classes can not be inherited.
  • (C) An abstract class contains only abstract methods.
  • (D) All of the above.

A

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Q. Which of these keywords are used to define an abstract class?

  • (A) abst
  • (B) abstract
  • (C) Abstract
  • (D) abstract class

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Q. If a class inheriting an abstract class does not define all of its function then it will be known as?

  • (A) abstract
  • (B) A simple class
  • (C) Static class
  • (D) None of the mentioned

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Q. Which of these is not a correct statement?

  • (A) Every class containing abstract method must be declared abstract.
  • (B) Abstract class defines only the structure of the class not its implementation.
  • (C) Abstract class can be initiated by new operator
  • (D) Abstract class can be inherited.

A

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Q. Which method defined in Integer class can be used to convert a whole number in string type to primitive int type.

  • (A) valueOf()
  • (B) intValue()
  • (C) parseInt()
  • (D) getInteger()

A

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Q. The method sqrt() is defined in the class

  • (A) System
  • (B) Root
  • (C) Math
  • (D) Arithmetic

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Q. A primitive data type can be passed as an argument into a method

  • (A) By value
  • (B) by reference
  • (C) both a & b
  • (D) none of these

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Q. Which of these is used as default for a member of a class if no access specifier is used for it?

  • (A) private
  • (B) public
  • (C) public, within its own package
  • (D) protected

A

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Q. Which of these keywords is used to refer to member of base class from a sub class?

  • (A) upper
  • (B) super
  • (C) this
  • (D) None of the mentioned

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