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What is the default value of a local variable in Java?

  • 0
  • null
  • FALSE
  • No default value
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Which package contains the Random class?

  • java.util
  • java.lang
  • java.io
  • java.net
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Which exception is thrown when a division by zero occurs?

  • NullPointerException
  • ArithmeticException
  • ArrayIndexOutOfBoundsException
  • NumberFormatException
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Which of the following is not a Java feature?

  • Object-oriented
  • Use of pointers
  • Portable
  • Dynamic
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Which method is used to stop the execution of a thread?

  • stop()
  • wait()
  • sleep()
  • terminate()
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Which method is used to perform some action when the object is to be destroyed?

  • delete()
  • finalize()
  • none()
  • destroy()
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Which method is used to terminate a thread in Java?

  • stop()
  • terminate()
  • end()
  • interrupt()
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Which keyword is used to inherit a class in Java?

  • extend
  • inherit
  • extends
  • implements
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What is the return type of the hashCode() method?

  • int
  • long
  • String
  • boolean
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Which method can be used to start a thread execution?

  • run()
  • start()
  • init()
  • resume()
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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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What does the AWT stand for?

  • All Window Tools
  • Abstract Window Toolkit
  • Abstract Windows Toolkit
  • All Windows Toolkit
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Which of these is used to create an object of a class?

  • Constructor
  • method
  • object
  • class
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Which one of the following is not a valid component of the Java environment?

  • JDK
  • JVM
  • JIT
  • JDB
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What does the expression float a = 35 / 0 return?

  • Infinity
  • NaN
  • 0
  • ArithmeticException
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Which of the following is the default value of a boolean variable?

  • TRUE
  • FALSE
  • null
  • undefined
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Which of these classes are immutable in Java?

  • String
  • StringBuffer
  • StringBuilder
  • None of the above
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What is a correct way to synchronize a method in Java?

  • synchronized void method()
  • synchronized(method)
  • sync void method()
  • void synchronized method()
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Which of the following statements is true?

  • JRE is a subset of JDK
  • JDK is a subset of JRE
  • JVM is a subset of JRE
  • JRE and JDK are subsets of JVM
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What does the JVM stand for?

  • Java Virtual Machine
  • Java Variable Machine
  • Java Verified Machine
  • Java Visual Machine
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Which keyword is used to prevent inheritance of a class?

  • final
  • static
  • abstract
  • const
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Which of the following is used to handle exceptions in Java?

  • try-catch block
  • finally block
  • throw statement
  • All of the above
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What is the output of 5/2 in Java?

  • 2.5
  • 2
  • 3
  • 2
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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 an access modifier in Java?

  • public
  • private
  • protected
  • default
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Which of the following is a reserved keyword in Java?

  • array
  • goto
  • constant
  • var
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Which of the following is a marker interface in Java?

  • Runnable
  • Serializable
  • Remote
  • ResultSet
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Which interface is used to store key-value pairs in Java?

  • Map
  • Set
  • List
  • Collection
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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 packages contains the Exception class?

  • java.io
  • java.lang
  • java.util
  • java.net
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