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What is the purpose of the volatile keyword in Java?

  • To increase the access level
  • To indicate that a variable may be changed unexpectedly
  • To mark a method as synchronized
  • To create a constant variable
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Which of these methods is used to access members of a class in Java?

  • dot operator (.)
  • arrow operator (->)
  • star operator (*)
  • pointer operator (&)
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Which of these operators is used to refer to the current instance of a method or a constructor?

  • this
  • super
  • extern
  • this()
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Which of the following is not a valid Java keyword?

  • transient
  • volatile
  • const
  • synchronized
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Which of the following is not a valid Java keyword?

  • strictfp
  • constant
  • goto
  • native
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Which of the following is not an OOP concept in Java?

  • Inheritance
  • Encapsulation
  • Polymorphism
  • Compilation
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Which operator is considered to be with the highest precedence?

  • ()
  • =
  • ?:
  • ++
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Which of these standard collection classes implements a dynamic array?

  • ArrayList
  • LinkedList
  • HashSet
  • HashMap
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Which class is used to read characters in Java?

  • FileReader
  • FileInputStream
  • BufferedInputStream
  • DataInputStream
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Which of these interface is not a part of Java?s collection framework?

  • List
  • Set
  • SortedList
  • Queue
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Which of the following is a valid declaration of a char?

  • char ch = '\utea';
  • char ch = '\uTEA';
  • char ch = '\utea';
  • All of the above
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What is the purpose of the 'super' keyword in Java?

  • To call a method in the superclass
  • To call a method in the same class
  • To call a method in the subclass
  • To call a method in the parent interface
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In which package is the JDBC API included?

  • javax.swing
  • java.net
  • java.sql
  • java.util
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Which of the following is used for inter-thread communication in Java?

  • notify()
  • wait()
  • notifyAll()
  • All of the above
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Which method is used to perform cleanup operations before an object is garbage collected?

  • finalize()
  • clean()
  • finalizeAll()
  • close()
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In which memory a String is stored, when we create a string using new operator?

  • Stack
  • String Pool
  • Heap memory
  • Random memory
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Which keyword is used for accessing the features of a package?

  • pkg
  • Pkg
  • import
  • Import
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What is the main advantage of using Java's multithreading?

  • Increased complexity
  • Reduced performance
  • Improved user experience
  • Lower memory usage
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Which of the following is true about a static method?

  • It can access instance variables
  • It can be overridden
  • It cannot be called from a static context
  • It can be called using the class name
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Which of the following is used to find and fix bugs in the Java programs?

  • JVM
  • JRE
  • JDK
  • JDB
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When a thread is created and started, what is its initial state?

  • Ready
  • Running
  • Waiting
  • Sleeping
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What is the base class of all classes in Java?

  • Object
  • Class
  • Base
  • Root
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Which of these cannot be used for a variable name in Java?

  • identifier & keyword
  • identifier
  • keyword
  • None of the above
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Which method in the Servlet interface is called once to initialize the servlet?

  • init()
  • start()
  • initServlet()
  • service()
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Which method is used to find the length of a string in Java?

  • length()
  • size()
  • getLength()
  • Length()
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Which of the following is true about the String class in Java?

  • Strings are mutable
  • Strings are immutable
  • Strings are of fixed length
  • Strings are primitive types
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What does the 'super' keyword in Java do?

  • Refers to the current object
  • Refers to the parent class object
  • Refers to a static method
  • Refers to a private method
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Which of the following is a checked exception?

  • NullPointerException
  • ClassCastException
  • IOException
  • ArrayIndexOutOfBoundsException
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What is the default access modifier in Java?

  • private
  • protected
  • public
  • package-private
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Which of these classes is not a member class of java.io package?

  • File
  • String
  • Writer
  • Reader
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