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Which of these cannot be used for a variable name in Java?

  • identifier
  • keyword
  • letter
  • underscore
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What is the default value of the local variables?

  • null
  • 0
  • depends on the type of variable
  • No default value for local variables
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Which of these methods is a part of the Object class?

  • notify(), wait(), sleep()
  • notify(), wait(), clone()
  • sleep(), wait(), notifyAll()
  • sleep(), wait(), getObject()
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What is the size of int variable in Java?

  • 8 bits
  • 16 bits
  • 32 bits
  • 64 bits
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Which of the following is not an access modifier in Java?

  • protected
  • private
  • public
  • transient
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What is the size of a byte variable in Java?

  • 8 bits
  • 16 bits
  • 32 bits
  • 64 bits
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What is the default value of a local variable?

  • null
  • 0
  • depends on the data type
  • no default value
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Which of the following is a marker interface?

  • Runnable
  • Remote
  • Readable
  • Result
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Which of these are valid identifiers?

  • _var
  • $var
  • var
  • All of the mentioned
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Which of the following is a reserved keyword in Java?

  • null
  • TRUE
  • goto
  • constant
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Which of these packages contains the exception classes?

  • java.lang
  • java.util
  • java.io
  • java.net
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Which of the following is a valid long literal?

  • 0xnf024L
  • ABH8097
  • L990023
  • 904423
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Which of these keywords is used to define interfaces in Java?

  • interface
  • Interface
  • intf
  • Intf
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Which keyword is used to create an interface in Java?

  • class
  • interface
  • 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 must be implemented by all threads?

  • run()
  • start()
  • stop()
  • main()
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Which keyword is used to refer to the current object?

  • this
  • super
  • self
  • current
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Which of these packages contains the exception StackOverflowError?

  • java.io
  • java.system
  • java.lang
  • java.util
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How many times can a constructor be called during the lifetime of the object?

  • As many times as necessary
  • Only once
  • Depends on the type of class
  • At least once
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Which of these methods is used to print an object in Java?

  • print()
  • println()
  • printf()
  • all of the mentioned
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Which of these operators is used to allocate memory to an array variable in Java?

  • malloc
  • alloc
  • new
  • new malloc
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What is the output of: System.out.println(2 + "2");

  • 4
  • 22
  • "4"
  • "22"
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What is the range of short data type in Java?

  • -128 to 127
  • -32768 to 32767
  • -2147483648 to 2147483647
  • None of the mentioned
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What is the default value of the Boolean variable?

  • TRUE
  • FALSE
  • null
  • not defined
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Which package contains the Random class?

  • java.util package
  • java.lang package
  • java.awt package
  • java.io package
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Which keyword is used for accessing the features of a package?

  • package
  • import
  • extends
  • implements
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Which exception is thrown when java is out of memory?

  • MemoryError
  • OutOfMemoryError
  • MemoryOutOfBoundsException
  • MemoryFullException
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What is the default value of an instance variable?

  • null
  • 0
  • depends on the type of variable
  • default values are same as local variables
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Which one is a template for creating different objects?

  • An array
  • A class
  • An interface
  • A method
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Which of the following is not a valid way to create an array in Java?

  • int[] arr = new int[5];
  • int[] arr = {1, 2, 3, 4, 5};
  • int arr[] = new int[5];
  • int arr() = new int[5];
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