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Exit Quiz

Which keyword is used to prevent inheritance of a class?

  • final
  • static
  • abstract
  • const
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Which of these access specifiers can be used for a main() method?

  • public
  • private
  • protected
  • default
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What is the purpose of the wait(), notify(), and notifyAll() methods in Java?

  • To perform inter-thread communication
  • To perform thread synchronization
  • To handle exceptions
  • None of the above
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Which class is used to read from a file in Java?

  • FileReader
  • FileWriter
  • BufferedWriter
  • PrintWriter
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Which of these cannot be used for a variable name in Java?

  • identifier
  • keyword
  • validVariableName
  • $variableName
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Which exception is thrown when java is out of memory?

  • MemoryError
  • OutOfMemoryError
  • MemoryOutOfBoundsException
  • MemoryFullException
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What does the expression float a = 35 / 0 return?

  • Infinity
  • NaN
  • 0
  • ArithmeticException
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Which method is used to terminate a thread in Java?

  • stop()
  • terminate()
  • end()
  • interrupt()
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Which package contains the Random class?

  • java.util
  • java.lang
  • java.io
  • java.net
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Which keyword is used to declare a constant variable?

  • final
  • static
  • const
  • immutable
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Which keyword is used to inherit a class in Java?

  • extend
  • inherit
  • extends
  • implements
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Which of the following is a superclass of every class in Java?

  • ArrayList
  • Abstract class
  • Object class
  • String class
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Which method is used to get the length of an array?

  • length()
  • size()
  • length
  • getSize()
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What is the implicit return type of a constructor?

  • void
  • int
  • No return type
  • None of the above
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Which method is used to compare two strings in Java?

  • equals()
  • ==
  • compare()
  • compareTo()
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Which method is used to convert a string to an integer in Java?

  • parseInt()
  • parseInteger()
  • toInt()
  • toInteger()
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Which of the following is not an OOPS concept in Java?

  • Polymorphism
  • Inheritance
  • Compilation
  • Encapsulation
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Which of the following is a marker interface?

  • Serializable
  • Cloneable
  • Remote
  • All of the above
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Which of the following is not a primitive data type in Java?

  • int
  • String
  • float
  • boolean
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Which of these methods are used to register a thread in a thread scheduler?

  • run()
  • start()
  • register()
  • None of the above
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Which of these classes are immutable in Java?

  • String
  • StringBuffer
  • StringBuilder
  • None of the above
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Which of these methods is used to register a thread in a thread scheduler?

  • run()
  • start()
  • register()
  • None of the above
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Which method can be used to find the length of a string in Java?

  • getSize()
  • sizeOf()
  • lengthOf()
  • length()
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Which of the following is not a valid flow control statement?

  • if
  • continue
  • exit
  • break
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What is the range of the short data type in Java?

  • -128 to 127
  • -32768 to 32767
  • -2147483648 to 2147483647
  • None of the above
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What is the use of the super keyword in Java?

  • To refer to the current object
  • To refer to the parent class object
  • To refer to the class variable
  • None of the above
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Which method is used to start a thread in Java?

  • run()
  • start()
  • init()
  • begin()
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What is the use of the this keyword in Java?

  • To refer to the current object
  • To refer to the parent class object
  • To refer to the class variable
  • None of the above
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Which of these are selection statements in Java?

  • if()
  • for()
  • continue
  • break()
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Which operator is considered to be with the highest precedence?

  • =
  • ==
  • ? :
  • ++
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