Java
MCQ questions and answers
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Java MCQ (116)
| 1. | ________ is known as user defined data type? |
| A | Class |
| B | Object |
| C | int |
| D | String |
|
Answer: A
Description: Class is known as Abstract Data Type(ADT). |
|
| 2. | ____________ is a unit of structural and behavioral modularity that contains a set of properties(or data) as well as the associate function. |
| A | Class |
| B | Method |
| C | Object |
| D | Abstraction |
|
Answer: C
|
|
| 3. | The wrapping up of data and methods into a single unit is known as____________. |
| A | Abstraction |
| B | Encapsulation |
| C | Object |
| D | None |
|
Answer: B
|
|
| 4. | ____________is the process of by which object of the one class can acquire the properties of another class. |
| A | Polymorphism |
| B | Virtual Function |
| C | Inheritance |
| D | Encapsulation |
|
Answer: C
|
|
| 5. | What is known as run time binding? |
| A | Static binding |
| B | Dynamic binding |
| C | Compilation |
| D | Execution |
|
Answer: B
|
|
| 6. | The inheritance provides the idea of____________. |
| A | persitance |
| B | portability |
| C | resuability |
| D | security |
|
Answer: C
|
|
| 7. | Java was developed at Sun Microsystem in 1991 by the team headed by____________. |
| A | James Gosling |
| B | Denish Ritchi |
| C | Paul Allen |
| D | none |
|
Answer: A
|
|
| 8. | Which is the first web browser developed in 1993? |
| A | Hot Java |
| B | Internet Explorer |
| C | Mozilla |
| D | Netscape Navigator |
|
Answer: A
|
|
| 9. | Java compiler convert java source code into ________ |
| A | MSIL code |
| B | Native Code |
| C | Binary Code |
| D | Byte Code |
|
Answer: D
|
|
| 10. | Which keyword is not belong to java programming language? |
| A | final |
| B | virtual |
| C | typedef |
| D | B & C |
|
Answer: D
|
|
| 11. | __________ method is replaced by the destructor function in java? |
| A | finalize() |
| B | finally() |
| C | destruct() |
| D | Garbage Collector |
|
Answer: A
|
|
| 12. | Which are tiny programs that can be downloaded from the internet and can be run on java compatible web browser? |
| A | Servlet |
| B | JSP |
| C | Applet |
| D | Flash |
|
Answer: C
|
|
| 13. | Which java command convert source code into intermediate byte code? |
| A | javap |
| B | javac |
| C | java |
| D | javax |
|
Answer: B
|
|
| 14. | ____________ is a set of various tools used to develop and execute java programs . |
| A | JDK |
| B | JRE |
| C | JVM |
| D | JSL |
|
Answer: A
|
|
| 15. | ______ access specifier provides the access of variables and functions to the object of another class. |
| A | private |
| B | public |
| C | protected |
| D | default |
|
Answer: B
|
|
| 16. | Which java command enable us to convert the bytecode into a program description? |
| A | javadoc |
| B | javac |
| C | javap |
| D | javah |
|
Answer: C
|
|
| 17. | Which command is used to find an error in the program? |
| A | javac |
| B | java |
| C | javadoc |
| D | jdb |
|
Answer: D
|
|
| 18. | Which java package consists the date and time related functions? |
| A | java.lang |
| B | java.awt |
| C | java.utility |
| D | java.applet |
|
Answer: C
|
|
| 19. | In java, ________ is the 16 bit character set that defines characters which is found in all human language? |
| A | ANSI |
| B | Unicode |
| C | Both |
| D | None |
|
Answer: B
|
|
| 20. | What is the starting execution point of java program? |
| A | main() |
| B | class |
| C | import |
| D | classname |
|
Answer: A
|
|
| 21. | Which of the following is an invalid identifier? |
| A | pg-hr |
| B | void |
| C | na60f |
| D | t$ggl |
|
Answer: B
|
|
| 22. | Which of the following is an invalid arithmatic expression? |
| A | 14/20/5 |
| B | (10/5)*3+6%2 |
| C | 64+/8.5 |
| D | (2+3)*9/3 |
|
Answer: C
|
|
| 23. | Which of these is an example of compound assignment operator? |
| A | a=5 |
| B | a=b=c=8 |
| C | a=b+c |
| D | a+=b/c |
|
Answer: D
|
|
| 24. | Which operator is used to check whether an object belong to a specific class? |
| A | instanceof |
| B | new |
| C | class |
| D | typedef |
|
Answer: A
|
|
| 25. | A ____________ serve as a template that provides a layout common to all of its instance known as____________. |
| A | class , inheritance |
| B | object, class |
| C | class, object |
| D | none of these |
|
Answer: C
|
|
| 26. | ____________ is a fixed size in the memory and it is having element of a similar data type |
| A | Pointer |
| B | Structure |
| C | Class |
| D | Array |
|
Answer: D
|
|
| 27. | A____________is defined as the smallest unit of a program. |
| A | class |
| B | object |
| C | identifiers |
| D | token |
|
Answer: D
|
|
| 28. | Constant is also called as ____________. |
| A | literals |
| B | token |
| C | identifier |
| D | keyword |
|
Answer: A
|
|
| 29. | Conditional statements are also known as____________statement. |
| A | selection |
| B | nested |
| C | both |
| D | none |
|
Answer: A
|
|
| 30. | The____________ operator can be used as an alternative to the if-else statements. |
| A | assignment |
| B | conditional |
| C | bitwise |
| D | arithmatic |
|
Answer: B
|
|
| 31. | The control statement that execute a set of statements repeatedly based on a condition is known as an____________. |
| A | iteration |
| B | increment |
| C | conditional |
| D | none |
|
Answer: A
|
|
| 32. | The____________statements are used to transfer the control from one part of the program to another. |
| A | break |
| B | continue |
| C | return |
| D | jump |
|
Answer: D
|
|
| 33. | ____________ statement is used to terminate the current iteration of the loop. |
| A | break |
| B | continue |
| C | return |
| D | goto |
|
Answer: B
|
|
| 34. | Which statement is use to transfer control back to the caller and terminate the method in which it is present? |
| A | continue |
| B | goto |
| C | return |
| D | none |
|
Answer: C
|
|
| 35. | A ____________ has the same relation to ____________ which is a like basic data type with a variable. |
| A | class , object |
| B | object, class |
| C | function, int |
| D | none of these |
|
Answer: A
|
|
| 36. | Which of following operator is used for create a new object and allocate the memory space? |
| A | dot operator |
| B | new operator |
| C | Instanceof operator |
| D | none of these |
|
Answer: B
|
|
| 37. | Which is the correct syntax of an accessing the members of a class? |
| A | class-member.class-object |
| B | class-name.class-member |
| C | class-object.class-name |
| D | class-object.class-member |
|
Answer: D
|
|
| 38. | Which method is used to pass a different values to the instance variable of different object? |
| A | parameterized |
| B | constructor |
| C | static method |
| D | instanceof |
|
Answer: A
|
|
| 39. | There are too way by which an argument can be passed to the____________ and ____________. |
| A | calling, called |
| B | call by value & call by reference |
| C | formal,parameter |
| D | none |
|
Answer: B
|
|
| 40. | ___________is a positive integer value which indicates the position of an element is refered in an array. |
| A | index |
| B | subscript |
| C | A and B both are same |
| D | array value |
|
Answer: C
|
|
| 41. | Which of these array elements is referred by arr[3]? |
| A | third |
| B | second |
| C | fourth |
| D | fifth |
|
Answer: C
|
|
| 42. | String is always specified in____________. |
| A | braces |
| B | single quotes |
| C | square bracket |
| D | double quotes |
|
Answer: D
|
|
| 43. | Which method of string class is used to remove all the white space at the beginning and end of the string? |
| A | trim() |
| B | concat() |
| C | subString() |
| D | space() |
|
Answer: A
|
|
| 44. | What is the value of str1.length() function? Ex. str= “I love my country"; |
| A | 16 |
| B | 17 |
| C | 19 |
| D | 20 |
|
Answer: B
|
|
| 45. | The class contain the method to store any number and any type of objects in a single unit called as _______ |
| A | Array |
| B | Reflection |
| C | Vector |
| D | StringBuffer |
|
Answer: C
|
|
| 46. | The initial capacity of a default vector is____________. |
| A | two |
| B | one |
| C | ten |
| D | zero |
|
Answer: C
|
|
| 47. | Which class is inherited by the new class is called as____________. |
| A | super class |
| B | child class |
| C | abstract class |
| D | inherited class |
|
Answer: A
|
|
| 48. | A java subclass can be derived by using the ____________keyword. |
| A | implements |
| B | extends |
| C | super |
| D | class |
|
Answer: B
|
|
| 49. | Which type of inheritance is not implemented by java? |
| A | Single level inheritance |
| B | Multilevel inheritance |
| C | Hierarchical inheritance |
| D | Multiple inheritance |
|
Answer: D
|
|
| 50. | In which of the following inheritance is inherited by more than one subclass? |
| A | Single level inheritance |
| B | Multiple inheritance |
| C | Hierarchical inheritance |
| D | Multilevel inheritance |
|
Answer: C
|
|
| 51. | A member declared as____________ which can be assessed only within the class. |
| A | private |
| B | public |
| C | protected |
| D | default |
|
Answer: A
|
|
| 52. | Which keyword prevent a method in a super class from being overridden by its subclass? |
| A | const |
| B | final |
| C | super |
| D | abstract |
|
Answer: B
|
|
| 53. | Java enable us to specify that a method must be overridden in the subclass by using ____________ keyword. |
| A | interface |
| B | class |
| C | abstract |
| D | final |
|
Answer: C
|
|
| 54. | Which of the following classes can not be inherited? |
| A | abstract class A |
| B | class B |
| C | final class C |
| D | none of these |
|
Answer: C
|
|
| 55. | The variable in an interface are by default ____________and____________. |
| A | static, private |
| B | final, public |
| C | private, public |
| D | static, final |
|
Answer: A
|
|
| 56. | Which java API package is automatically imported? |
| A | java.util |
| B | java.awt |
| C | java.lang |
| D | java |
|
Answer: C
|
|
| 57. | The ____________statement is used to access the particular package in a program |
| A | import |
| B | using |
| C | package |
| D | namespace |
|
Answer: A
|
|
| 58. | Suppose there is a package PERSON which contains a public class Employee, then source file Employee.java will be stored in the sub-directory whose name is ____________. |
| A | person |
| B | employee |
| C | package |
| D | none |
|
Answer: A
|
|
| 59. | Applet uses the various method of ____________ and ____________ class. |
| A | Applet, Awt |
| B | Swing, Applet |
| C | Frame, Applet |
| D | Applet, Graphics |
|
Answer: D
|
|
| 60. | The execution of an applet begin from ____________ method. |
| A | init() |
| B | main() |
| C | load() |
| D | start() |
|
Answer: A
|
|
| 61. | ____________ method is used to remove the applet permanently from the memory. |
| A | destroy() |
| B | delete() |
| C | garbabe collector |
| D | stop() |
|
Answer: A
|
|
| 62. | What is the sequence of method invoked automatically when an applet is loaded till it is destroyed? |
| A | init(), paint(), start(), stop(), destroy(). |
| B | start(), init(), paint(), stop(), destroy(). |
| C | start(), paint(), init(), destroy(), stop(). |
| D | init(), start(),paint(), stop(), destroy(). |
|
Answer: D
|
|
| 63. | The ____________ method is used to display a string on an applet. |
| A | paint() |
| B | string() |
| C | drawString() |
| D | init() |
|
Answer: C
|
|
| 64. | Which tag is used to pass user defined parameter to an applet? |
| A | INPUT |
| B | VALUE |
| C | PARAM |
| D | None |
|
Answer: C
|
|
| 65. | The following tags are mandatory to display the applet. |
| A | NAME , CODE, HEIGHT |
| B | CODEBASE, HEIGHT, WIDTH |
| C | CODE, HEIGHT, WIDTH |
| D | CODE, NAME |
|
Answer: C
|
|
| 66. | Which method of the graphics class is used to draw image on an applet? |
| A | drawString() |
| B | draw() |
| C | drawImage() |
| D | paint() |
|
Answer: C
|
|
| 67. | Which of the following is a true statement? |
| A | Java 1.0 modal has replace by Delegation Event Model |
| B | The Delegation Event Model use event listeners to handle event |
| C | Java 1.0 model is more efficient than Delegation Event Model |
| D | The Delegation Event Model uses handleEvent() method to process event |
|
Answer: B
|
|
| 68. | The parent class in delegation event model is____________. |
| A | Object |
| B | EventObject |
| C | Frame |
| D | Container |
|
Answer: B
|
|
| 69. | Which event is generated by the click of button? |
| A | KeypressEvent |
| B | ButtonPressEvent |
| C | ActionEvent |
| D | ClickEvent |
|
Answer: C
|
|
| 70. | The ____________interface defines a method to handle the event related to keys in java program. |
| A | actionPerformed |
| B | keyPress |
| C | keyListener |
| D | actionListener |
|
Answer: C
|
|
| 71. | Which class implements an event listener interface and define all of its method with a blank body? |
| A | Wrapper |
| B | Interface |
| C | Adapter |
| D | Abstract |
|
Answer: C
|
|
| 72. | Which errors are difficult to detect? |
| A | Compiler time error |
| B | Runtime error |
| C | Both |
| D | None |
|
Answer: B
|
|
| 73. | An exception is caused by ____________. |
| A | Compiler time error |
| B | Logical error |
| C | Runtime error |
| D | None |
|
Answer: C
|
|
| 74. | Java exception handling mechanism mainly use five keywords. |
| A | try, catch, finally, static, public. |
| B | try, catch, public, exception, throw |
| C | try, catch, finally,throw, throws |
| D | try, catch, finally, exception, Synchronized |
|
Answer: C
|
|
| 75. | All the exception classes are inherited from the following built in classes which is known as______ |
| A | Exception |
| B | Throwable |
| C | Error |
| D | Runtime Execution |
|
Answer: B
|
|
| 76. | A set of statements that may throw an exception in a program code is enclosed within the____________ block. |
| A | try |
| B | finally |
| C | main() |
| D | catch |
|
Answer: A
|
|
| 77. | Which exception is thrown when an illegal argument is used to invoke a method? |
| A | IllegalArgumentException |
| B | NullPointerException |
| C | IOException |
| D | NumberFormatException |
|
Answer: A
|
|
| 78. | Which of the following will not generate an error? |
| A | A catch block without a try block. |
| B | Presence of code between try and catch block. |
| C | A try block with either a catch or finally block. |
| D | A finally block without a try block. |
|
Answer: C
|
|
| 79. | The descriptive information about the exception occurred during program where execution can be retrieved using ____________method of the throwable class. |
| A | printStackTrace() |
| B | printTrace |
| C | createOwnException |
| D | desc() |
|
Answer: A
|
|
| 80. | A ____________ is a set of instructions that facilitates problem solving ability. |
| A | algorithm |
| B | software |
| C | program |
| D | none |
|
Answer: C
|
|
| 81. | Which java package is used to handle input output operations? |
| A | java.lang |
| B | java.util |
| C | java.io |
| D | java.awt |
|
Answer: C
|
|
| 82. | Stream classes can be categorized into two types namely. |
| A | Byte stream classes, character stream classes |
| B | File reader, File writer |
| C | InputStream , OutputStream |
| D | ByteRead, ByteWrite |
|
Answer: A
|
|
| 83. | Which method is used to clearing the content of buffer? |
| A | destroy() |
| B | empty() |
| C | emptyBuffer() |
| D | flush() |
|
Answer: D
|
|
| 84. | Which class is used to read input from the console input device? |
| A | ReadLine() |
| B | BufferReader() |
| C | InputStreamReader |
| D | ByteStreamReader |
|
Answer: C
|
|
| 85. | Which class is used to write the bytes to file? |
| A | FileReader |
| B | FileWriter |
| C | OutputStream Classes |
| D | fileOutputStream |
|
Answer: B
|
|
| 86. | What value does the read() method return when the end of file is reached? |
| A | Zero |
| B | One |
| C | Null |
| D | -1 (minus One) |
|
Answer: D
|
|
| 87. | Which class is used to read character from the file? |
| A | ReadBuffer |
| B | InputStreamReader |
| C | FileReader() |
| D | CharacterStream |
|
Answer: C
|
|
| 88. | DataInputStream class contains methods to read ____________. |
| A | primitive datatype |
| B | stream |
| C | file |
| D | none |
|
Answer: A
|
|
| 89. | Which class is allows the creation of a file that allows you to move the file pointer to a random position in the file prior to read or write operation? |
| A | File |
| B | FileReader and FileWriter class |
| C | RandomAccess File |
| D | Stream |
|
Answer: C
|
|
| 90. | Which method is used return a reference to the thread? |
| A | Thread |
| B | currentThread |
| C | run |
| D | none |
|
Answer: B
|
|
| 91. | The only method which is available in runnable interface is____________. |
| A | start() |
| B | run() |
| C | sleep |
| D | stop() |
|
Answer: B
|
|
| 92. | Which thread is known as a default thread which start executing immediately at the time of execution? |
| A | main() |
| B | init() |
| C | thread |
| D | none |
|
Answer: A
|
|
| 93. | The join() method takes the parameter in____________. |
| A | second |
| B | minuit |
| C | millisecond |
| D | none |
|
Answer: C
|
|
| 94. | Which keyword is used to synchronize a method or a block of statements? |
| A | synchonized |
| B | notify |
| C | yield |
| D | join |
|
Answer: A
|
|
| 95. | Which of the following is the default priority of a thread? |
| A | Zero |
| B | Five |
| C | One |
| D | Ten |
|
Answer: B
|
|
| 96. | The situation in which two or more thread are in a simultaneously waiting state for release of the resources which is held by one of the other waiting thread is called____________. |
| A | deadlock |
| B | spinlock |
| C | mutual exclusion |
| D | none |
|
Answer: A
|
|
| 97. | _______ methods are used in the inter-thread communication in Java. |
| A | wait(), notify(), notifyall() |
| B | wait(), join() |
| C | notify(), join(), notifyall() |
| D | none |
|
Answer: A
|
|
| 98. | _____ protocol is a connection oriented and reliable for the communication. |
| A | UDP |
| B | TCP |
| C | IP |
| D | SMTP |
|
Answer: B
|
|
| 99. | ______ protocol is a connection less protocol that manages the address part of each packet so that the package reaches the right destination? |
| A | IP |
| B | HTTP |
| C | TCP |
| D | UDP |
|
Answer: A
|
|
| 100. | The internet provides delivery services using a suit of the protocols are known as ____________. |
| A | TCP |
| B | IP |
| C | TCP/IP |
| D | UDP |
|
Answer: C
|
|
| 101. | Which of these protocol is/are used to implement the network layer? |
| A | TCP |
| B | IP |
| C | UDP |
| D | Both A and C |
|
Answer: B
|
|
| 102. | The port number _____ is reserved for http. |
| A | 80 |
| B | 1024 |
| C | 1000 |
| D | 512 |
|
Answer: A
|
|
| 103. | The IPv6 represent___ bit of address. |
| A | 32 |
| B | 64 |
| C | 128 |
| D | 512 |
|
Answer: C
|
|
| 104. | The combination of IP address and port no is known as ———- |
| A | packet |
| B | socket |
| C | frame |
| D | message |
|
Answer: B
|
|
| 105. | Which class is use to resolve the domain names to their IP address and vice versa? |
| A | InetAddress |
| B | serverSocket |
| C | DatagramSocket |
| D | HttpURLConnection |
|
Answer: A
|
|
| 106. | The DatagramSocket class is used to send or receive the ____________. |
| A | responce |
| B | message |
| C | datagram packets |
| D | packet |
|
Answer: C
|
|
| 107. | TCP server and client sockets are implemented using classes____________ and ____________ respectively. |
| A | ServerSocket, Socket |
| B | Datagram , Socket |
| C | InetAddress, ServerSocket |
| D | InetAddress, Socket |
|
Answer: A
|
|
| 108. | If any error occurred while creating the datagram socket which type of exception will raise? |
| A | IOException |
| B | packetNotFoundException |
| C | SocketException |
| D | none |
|
Answer: C
|
|
| 109. | _______ is the endpoint of a two way communication link between two programs running on the network? |
| A | clientport |
| B | port |
| C | socket |
| D | none |
|
Answer: C
|
|
| 110. | Which driver is use to access data through the driver using ODBC standard? |
| A | Native API Partly Java |
| B | JDBC-ODBC -Bridge |
| C | Native protocol all java |
| D | Net protocol all java client |
|
Answer: C
|
|
| 111. | _______ driver is a server based driver which uses network and middleware protocol for a communication with the server, further it translate to the DBMS specific function calls? |
| A | Net protocol all java-client |
| B | JDBC-ODBC |
| C | Native-API partly |
| D | Native protocal java |
|
Answer: A
|
|
| 112. | Which class is responsible for loading the driver specific classes? |
| A | DriverManager |
| B | registerDriver |
| C | Connection |
| D | resultSet |
|
Answer: A
|
|
| 113. | ____________ method allows you to specify the SQL query in which unknown values are replaced by question mark. Ex. “?" |
| A | getConnection() |
| B | preparedStatement |
| C | createStatement() |
| D | executeQuery |
|
Answer: B
|
|
| 114. | The ____________method provide the information about the vendor specific error whose meaning is defined by the driver vendor only. |
| A | getErrorCode() |
| B | SQLException() |
| C | error() |
| D | getNextException() |
|
Answer: A
|
|
| 115. | Which interface is use to establish a connection which the database? |
| A | Statement |
| B | getConnection |
| C | Connection |
| D | DriverManager |
|
Answer: C
|
|
| 116. | Which method is used to move the ResultSet cursor to a next row of the data? |
| A | boolean next() |
| B | boolean moveNext() |
| C | boolean read() |
| D | string getString(String column) |
| Answer: A |
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