Java Program MCQ

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

• Which of these classes is not part of Java's collection framework?
  ক

  Maps

  খ

  Array

  গ

  Stack

  ঘ

  Queue
• Which of this interface is not a part of Java's collection framework?
  ক

  List

  খ

  Set

  গ

  SortedMap

  ঘ

  SortedList
• Which of these is a super class of wrappers Long, Character & Integer?
  ক

  Long

  খ

  Digits

  গ

  Float

  ঘ

  Number
• Can "abstract" keyword be used with constructor, Initialization Block, Instance Initialization and Static Initialization Block.
  ক

  True

  খ

  False
• Which of the following is the correct way of importing an entire package 'pkg'?
  ক

  import pkg.

  খ

  Import pkg.

  গ

  import pkg.*

  ঘ

  Import pkg.*
• Standard output variable 'out' is defined in which class?
  ক

  Void

  খ

  Process

  গ

  Runtime

  ঘ

  System
• Which of these packages contain classes and interfaces used for input & output operations of a program?
  ক

  java.util

  খ

  java.lang

  গ

  java.io

  ঘ

  all of the mentioned
• How to assign values to variable using property?
  ক

  [ <p><span>A. <pre><code class="java">@Value("${my.property}")private String prop;</code></pre> <p><span>B. <pre><code class="java">@Property("${my.property}")private String prop;</code></pre>

  খ

  <pre><code class="java">@Environment("${my.property}")private String prop;</code></pre>

  গ

  <pre><code class="java">@Env("${my.property}")private String prop;</code></pre>
• 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 class have only one field 'TYPE'?
  ক

  Void

  খ

  Process

  গ

  System

  ঘ

  Runtime
• What is the value of double consonant 'E' defined in Math class?
  ক

  approximately 3

  খ

  approximately 3.14

  গ

  approximately 2.72

  ঘ

  approximately 0
• What is the length of the application box made in the following Java program?<br><pre><code class="java">import java.awt.*;import java.applet.*;public class myapplet extends Applet{ Graphic g; g.drawString("A Simple Applet",20,20); }</code></pre>
  ক

  20

  খ

  Default value

  গ

  Compilation Error

  ঘ

  Runtime Error
• Which of these is an correct way of defining generic class?
  ক

  class name(T1, T2, ..., Tn) { /* ... */ }

  খ

  class name<t1 t2 ... tn> { /* ... */ }</t1>

  গ

  class name { /* ... */ }

  ঘ

  class name{T1, T2, ..., Tn} { /* ... */ }
• What is the value of "d" in the following Java code snippet?<br><pre><code class="java">double d = Math.round ( 2.5 + Math.random() );</code></pre>
  ক

  2

  খ

  3

  গ

  4

  ঘ

  2.5
• What does System.getProperty("variable") return?
  ক

  compilation error

  খ

  value stored in variable

  গ

  runtime error

  ঘ

  null
• Which of these packages contain all the Java's built in exceptions?
  ক

  java.io

  খ

  java.util

  গ

  java.lang

  ঘ

  java.net
• Which of these is a super class of wrappers Double &amp; Integer?
  ক

  Long

  খ

  Digits

  গ

  Float

  ঘ

  Number
• Which annotation is used to represent command line input and assigned to correct data type?
  ক

  @Input

  খ

  @Variable

  গ

  @Command Line

  ঘ

  @Parameter
• In Java, what does the `this` keyword refer to?
  ক

  It defines JavaBean properties

  খ

  It executes SQL queries

  গ

  It creates JavaBeans

  ঘ

  It refers to the current instance of the class
• What is the purpose of the `synchronized` keyword in Java?
  ক

  To create JavaBeans

  খ

  To execute SQL queries

  গ

  To create a synchronized block of code for multithreading

  ঘ

  To define JavaBean properties
• Which Java class is used to represent an ordered collection of elements?
  ক

  Map

  খ

  List

  গ

  Queue

  ঘ

  Map
• In Java, which exception is thrown when an object is accessed before it has been initialized?
  ক

  InitializationException

  খ

  ObjectNotInitializedException

  গ

  NullPointerException

  ঘ

  NullReferenceException
• What is the purpose of the `instanceof` operator in Java?
  ক

  To create JavaBeans

  খ

  To execute SQL queries

  গ

  To define JavaBean properties

  ঘ

  To check if an object is an instance of a particular class or interface
• Which Java operator is used to perform a bitwise XOR operation between two integers?
  ক

  ^

  খ

  &amp;&amp;

  গ

  ||

  ঘ

  &amp;
• What is the output of the following code snippet in Java? `System.out.println(Math.pow(2, 3));`
  ক

  6

  খ

  2

  গ

  Compilation Error

  ঘ

  8
• In Java, what is the purpose of the `transient` keyword when applied to an instance variable?
  ক

  To create JavaBeans

  খ

  To execute SQL queries

  গ

  It indicates that the variable should not be serialized

  ঘ

  To define JavaBean properties
• What does the `super` keyword refer to in Java?
  ক

  It executes SQL queries

  খ

  It refers to the superclass of the current class

  গ

  It creates JavaBeans

  ঘ

  It executes SQL queries
• Which Java keyword is used to define a subclass that inherits from another class?
  ক

  implements

  খ

  inherits

  গ

  extends

  ঘ

  subclass
• In Java, which exception is thrown when an attempt is made to access an array element with an index that is negative or greater than or equal to the array size?
  ক

  OutOfBoundsException

  খ

  ArrayOutOfBoundsError

  গ

  IndexOutOfBoundsException

  ঘ

  ArrayIndexOutOfBoundsException
• What is the result of the following code in Java? `System.out.println(10 &gt; 5 ? "true" : "false");`
  ক

  true

  খ

  false

  গ

  Compilation Error

  ঘ

  Runtime Error