Java.lang MCQ

Test your knowledge with important Java.lang MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Java.lang MCQs at Bissoy

• Which of these methods of a Thread class is used to suspend a thread for a period of time?
  ক

  sleep()

  খ

  terminate()

  গ

  suspend()

  ঘ

  stop()
• Which of this interface is implemented by Thread class?
  ক

  Runnable

  খ

  Connections

  গ

  Set

  ঘ

  MapConnections
• Which of these class is used to make a thread?
  ক

  String

  খ

  System

  গ

  Thread

  ঘ

  Runnable
• Which of the interface contains all the methods used for handling thread related operations in Java?
  ক

  Runnable interface

  খ

  Math interface

  গ

  System interface

  ঘ

  ThreadHandling interface
• Which of these class defines how the classes are loaded?
  ক

  Class

  খ

  System

  গ

  Runtime

  ঘ

  ClassLoader
• Which of these methods return a class object given its name?
  ক

  getClass()

  খ

  findClass()

  গ

  getSystemClass()

  ঘ

  findSystemClass()
• Which of these methods returns the class of an object?
  ক

  getClass()

  খ

  Class()

  গ

  WhoseClass()

  ঘ

  WhoseObject()
• Which of these classes encapsulate runtime state of an object?
  ক

  Class

  খ

  System

  গ

  Runtime

  ঘ

  Cache
• Which of these Exceptions is thrown by loadClass() method of ClassLoader class?
  ক

  IOException

  খ

  SystemException

  গ

  ClassFormatError

  ঘ

  ClassNotFoundException
• Which of these methods returns the total number of bytes of memory available to the program?
  ক

  getMemory()

  খ

  TotalMemory()

  গ

  SystemMemory()

  ঘ

  getProcessMemory()
• Which of the following exceptions is thrown by every method of Runtime class?
  ক

  IOException

  খ

  SystemException

  গ

  SecurityException

  ঘ

  RuntimeException
• Which of these classes encapsulate runtime environment?
  ক

  Class

  খ

  System

  গ

  Runtime

  ঘ

  ClassLoader
• toRadian() and toDegree() methods were added by which version of Java?
  ক

  Java 1.0

  খ

  Java 1.5

  গ

  Java 2.0

  ঘ

  Java 3.0
• Which of these method converts radians to degrees?
  ক

  toRadian()

  খ

  toDegree()

  গ

  convertRadian()

  ঘ

  converDegree()
• Which of these method returns the remainder of dividend / divisor?
  ক

  remainder()

  খ

  getRemainder()

  গ

  CSIremainder()

  ঘ

  IEEEremainder()
• Which of these method return a pseudorandom number?
  ক

  rand()

  খ

  random()

  গ

  randomNumber()

  ঘ

  randGenerator()
• Which of these class contains all the methods present in Math class?
  ক

  SystemMath

  খ

  StrictMath

  গ

  Compiler

  ঘ

  ClassLoader
• Which of these class have only one field?
  ক

  Character

  খ

  Boolean

  গ

  Byte

  ঘ

  void
• Which of these methods is used to know whether a string contains “true”?
  ক

  valueOf()

  খ

  valueOfString()

  গ

  getString()

  ঘ

  none of the mentioned
• Which of these methods return string equivalent of Boolean object?
  ক

  getString()

  খ

  toString()

  গ

  converString()

  ঘ

  getStringObject()
• Which of the following constant are defined in Boolean wrapper?
  ক

  TRUE

  খ

  FALSE

  গ

  TYPE

  ঘ

  All of the mentioned
• Which of these methods of Boolean wrapper returns boolean equivalent of an object.
  ক

  getBool()

  খ

  booleanValue()

  গ

  getbooleanValue()

  ঘ

  getboolValue()
• Which of these coding techniques is used by method isDefined()?
  ক

  Latin

  খ

  ASCII

  গ

  ANSI

  ঘ

  UNICODE
• Which of these methods is used to know whether a given Character object is part of Java’s Identifiers?
  ক

  isIdentifier()

  খ

  isJavaIdentifier()

  গ

  isJavaIdentifierPart()

  ঘ

  none of the mentioned
• Which of these is a super class of Character wrapper?
  ক

  Long

  খ

  Digits

  গ

  Float

  ঘ

  Number
• Which of the following constant are defined in Character wrapper?
  ক

  MAX_RADIX

  খ

  MAX_VALUE

  গ

  TYPE

  ঘ

  All of the mentioned
• Which of these methods of Character wrapper can be used to obtain the char value contained in Character object.
  ক

  get()

  খ

  getVhar()

  গ

  charValue()

  ঘ

  getCharacter()
• Which of these methods is not defined in both Byte and Short wrappers?
  ক

  intValue()

  খ

  isInfinite()

  গ

  toString()

  ঘ

  hashCode()
• Which of these is a super class of wrappers Byte and short wrappers?
  ক

  Long

  খ

  Digits

  গ

  Float

  ঘ

  Number
• Which of the following methods Byte wrapper return the value as a double?
  ক

  doubleValue()

  খ

  converDouble()

  গ

  getDouble()

  ঘ

  getDoubleValue()