Java MCQs with answers Page - 36

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Q. Which of the following is a type of polymorphism in Java?

  • (A) Compile time polymorphism
  • (B) Execution time polymorphism
  • (C) Multiple polymorphism
  • (D) Multilevel polymorphism

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Q. When does method overloading is determined?

  • (A) At run time
  • (B) At compile time
  • (C) At coding time
  • (D) At execution time

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Q. Which concept of Java is a way of converting real world objects in terms of class?

  • (A) Polymorphism
  • (B) Encapsulation
  • (C) Abstraction
  • (D) Inheritance

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Q. Which component is responsible to optimize bytecode to machine code?

  • (A) JVM
  • (B) JDK
  • (C) JIT
  • (D) JRE

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Q. How can we identify whether a compilation unit is class or interface from a .class file?

  • (A) Java source file header
  • (B) Extension of compilation unit
  • (C) We cannot differentiate between class and interface
  • (D) The class or interface name should be postfixed with unit type

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Q. Which of these packages contains abstract keyword?

  • (A) java.lang
  • (B) java.util
  • (C) java.io
  • (D) java.system

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Q. Which of these class is used to create an object whose character sequence is mutable?

  • (A) String()
  • (B) StringBuffer()
  • (C) String() & StringBuffer()
  • (D) None of the mentioned

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Q. Which of these method of class StringBuffer is used to find the length of current character sequence?

  • (A) length()
  • (B) Length()
  • (C) capacity()
  • (D) Capacity()

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Q. Which of the following below live on the heap in java?

  • (A) Class
  • (B) Instance variable
  • (C) Method
  • (D) Object

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Q. Which of the following interface is used to declare core methods in java?

  • (A) Set
  • (B) EventListner
  • (C) Collection
  • (D) Comparator

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