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 * Home
 * Computer Science
 * Java


JAVA MCQ COMPUTER SCIENCE

Attempt now to check your rank among 21 students! 50 Questions 30 Mins
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ABOUT JAVA

Following are some of the multiple choice questions on the Java with answers
that will help the students in developing their knowledge.


JAVA MCQ


1. PICK ALL NON-PRIMITIVE DATATYPES FROM BELOW :

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 * Report
 * Discuss

 * String
 * Array
 * Both a & b
 * None of these


2. ____________ IS CONVERSION OF ONE DATATYPE TO ANOTHER WITH USERS
INTERVENTION.

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 * Report
 * Discuss

 * Typecasting
 *  explicit typecasting


3. THE LIFE CYCLE OF A THREAD IN JAVA IS CONTROLLED BY

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 * Report
 * Discuss

 * JRE
 * JDK
 * JVM
 * None


4. WHICH WILL CONTAIN THE BODY OF THE THREAD IN JAVA?

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 * Report
 * Discuss

 * Start()
 * Run()
 * Main()
 * Execute()


5. WHICH METHOD IS USED TO MAKE MAIN THREAD TO WAIT FOR ALL CHILD THREADS

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 * Report
 * Discuss

 * Join ()
 * Sleep ()
 * Wait ()
 * Stop ()


6. HOW MANY WAYS A THREAD CAN BE CREATED IN JAVA MULTITHREADING?

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 * Report
 * Discuss

 * 1
 * 2
 * 5
 * 10


7. JAVA IS A PROGRAMMING LANGUAGE THAT IS CLASS-BASED, OBJECT-ORIENTED AND
___________________.

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 * Discuss

 * Flexible
 * Procedural
 * Concurrent
 * Imported


8. WHAT IS THE NAME OF THE COMPANY THAT DEVELOPED JAVA?

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 * Discuss

 * Sun Microsystems
 * IBM
 * The Green Team
 * Microsoft


9. ON WHAT YEAR WAS OAK RENAMED AS JAVA

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 * Discuss

 * 1998
 * 1999
 * 1996
 * 1995


10. IT IS DESIGNED TO ADAPT TO AN EVOLVING ENVIRONMENT.

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 * Discuss

 * Secure
 * Integrated
 * High-Performance
 * Dynamic


11. JAVA IS DESIGNED FOR THE DISTRIBUTED ENVIRONMENT OF THE INTERNET.

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 * Dynamic
 * Distributed
 * Simple
 * Portable


12. WHICH FEATURE ENABLES JAVA TO DEVELOP VIRUS-FREE, TAMPER-FREE SYSTEMS?

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 * Discuss

 * Secure
 * Interpreted
 * Encrypted
 * Dynamic


13. WITH THE USE OF JUST-IN-TIME COMPILERS, JAVA ENABLES HIGH PERFORMANCE. WHICH
CHARACTERISTIC WAS DESCRIBED?

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 * Architecture-Neutral
 * Dynamic
 * High Performance
 * Portable


14. JAVA BYTE CODE IS TRANSLATED ON THE FLY TO NATIVE MACHINE INSTRUCTIONS AND
IS NOT STORED ANYWHERE MAKING THE DEVELOPMENT MORE RAPID AND ANALYTICAL.

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 * Distributed
 * Interpreted
 * High Performance
 * Object-Oriented


15. WHICH FEATURE MAKES IT POSSIBLE TO WRITE PROGRAMS THAT CAN PERFORM MANY
TASKS SIMULTANEOUSLY.

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 * Discuss

 * Interpreted
 * Multithreaded
 * Efficient
 * Multi-purpose


16. JAVA MAKES AN EFFORT TO ELIMINATE ERROR-PRONE SITUATIONS BY EMPHASIZING
MAINLY ON COMPILE TIME ERROR CHECKING AND RUNTIME CHECKING.

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 * Efficient
 * Dynamic
 * Robust
 * Secure


17. WHICH FEATURE IS CHARACTERIZED BY JAVA HAVING NO IMPLEMENTATION-DEPENDENT
ASPECTS ON ANY PLATFORM?

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 * Discuss

 * Robust
 * Distributed
 * Multithreaded
 * Portable


18. JAVA COMPILER GENERATES AN OBJECT FILE FORMAT THAT IS EXECUTABLE ON MANY
PROCESSORS, WITH THE PRESENCE OF JAVA RUNTIME SYSTEM.

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 * Dynamic
 * Distributed
 * Platform-independent
 * Architecture-Neutral


19. JAVA IS DESIGNED TO BE EASY TO LEARN AND MAKES USE OF KEYWORDS CLOSE TO
HUMAN LANGUAGE

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 * User-Friendly
 * Efficient
 * Simple
 * Robust


20. WHEN JAVA IS COMPILED, IT IS NOT COMPILED ON A PLATFORM SPECIFIC MACHINES,
RATHER ON A PLATFORM INDEPENDENT BYTE CODE.

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 * Architecture Neutral
 * Platform Independent
 * Portable
 * Interpreted


21. IN JAVA, EVERYTHING IS AN OBJECT. JAVA CAN BE EASILY EXTENDED SINCE IT IS
BASED ON THE OBJECT MODEL. WHICH CHARACTERISTIC OF JAVA WAS DESCRIBED?

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 * Discuss

 * Object-oriented
 * Simple
 * Secure
 * Robust


22. WHAT IS THE CORRECT RELATION BETWEEN LENGTH AND LAST-INDEX OF ARRAY?

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 * last-index is always 1 more than the length
 * last-index is 1 less than the length (but not always)
 * last-index is always 1 less than the length
 * last-index is always equal to the length


23. SELECT CORRECT CODE TO CREATE AN ARRAY OF "DOUBLE" DATATYPE OF LENGTH 5.

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 * Discuss

 * double arr = double[5];
 * double{} arr = new double{5};
 * double[5] arr = new double[];
 * double[] arr = new double[5];


24. STRING[] FRIENDS = {"JOHN", "MIKE", "SAMANTHA", "MONICA"};WHICH CODE IS
CORRECT TO PRINT "SAMANTHA" USING ARRAY FUNCTIONALITY?

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 * Discuss

 * System.out.println(friends[2]);
 * System.out.println(friends[3]);
 * System.out.println(friends["Samantha"]);
 * System.out.println(friends{2});


25. INT[] MYARRAY = {11, 22, 33, 44, 55};WHICH CODE IS CORRECT TO PRINT LENGTH
OF ABOVE INT-ARRAY?

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 * Discuss

 * System.out.println(int[].myArray.length());
 * System.out.println(myArray.length);
 * System.out.println(myArray.length());
 * System.out.println(int[].myArray.size());


26. WHAT IS THE MOST APPROPRIATE WAY TO CHECK IF TWO STRINGS ARE IDENTICAL?

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 * string1 == string2
 * string1.equals(string2)
 * string1.same(string2)
 * string1.equalsIgnorecase(string2)


27. WHAT IS THE RETURN TYPE OF EQUALSIGNORECASE() METHOD?

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 * int
 * String
 * char
 * boolean


28. WHAT WILL BE THE OUTPUT OF BELOW CODE? STRING STATEMENT = "OUTFIT OF THE
DAY"; SYSTEM.OUT.PRINTLN(STATEMENT.SUBSTRING(3,6));

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 * Report
 * Discuss

 * it of
 * tfit
 * fit
 * FIT


29. GUESS THE OUTPUT IN JAVA

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 * Discuss

String x = "10";
String y = "20";
String z = x + y;
System.out.println(z);

 * 1020
 * 10 20
 * 30
 * "10 20"


30. CHOOSE CORRECT PURPOSE OF INDEXOF() IN STRING CLASS.

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 * Discuss

 * returns the index (the position) of the last occurrence of a specified text
   in a string
 * returns the character of the first occurrence of a specified character in a
   string
 * returns the index (the position) of the first occurrence of a specified text
   in a string (excluding whitespace)
 * returns the index (the position) of the first occurrence of a specified text
   in a string (including whitespace)


31. WHICH IS CORRECT METHOD TO CONVERT STRING INTO UPPERCASE

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 * Discuss

 * changeUpperCase()
 * convertUpperCase()
 * toUpper()
 * toUpperCase()


32. STRING TXT = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";WHAT IS THE CORRECT WAY TO FIND
THE LENGTH OF "TXT" STRING?

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 * Report
 * Discuss

 * int len = length(txt);
 * float len = txt.length();
 * int len = txt.length();
 * double len = length(txt);


33. WHICH DATA TYPE GETS RETURNED FROM LENGTH() METHOD IN STRING CLASS?

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 * Report
 * Discuss

 * double
 * String
 * int
 * number


34. WHICH METHOD TO USE TO FIND LENGTH OF A STRING?

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 * Report
 * Discuss

 * length()
 * size()
 * long()
 * count()


35. WHAT IS THE DEFAULT VALUE OF A BOOLEAN VARIABLE?

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 * Discuss

 * True
 * true
 * False
 * false


36. INT X=15;LONG Y=X;WHICH TYPE OF CASTING IS SHOWN ABOVE?

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 * Report
 * Discuss

 * Explicit typecasting
 * Implicit typecasting


37. DOUBLE X=15.2;INT Y=(INT)X;WHICH TYPE OF CASTING IS SHOWN ABOVE?

 * Bookmark
 * Report
 * Discuss

 * Explicit typecasting
 * Implicit typecasting


38. __________ ARE THE NAMES OF VARIABLES, METHODS, CLASSES, PACKAGES AND
INTERFACES.

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 * Discuss

 * Identifiers


39. AN EXPRESSION WHICH INCLUDES DIFFERENT TYPES OF VARIABLES OR VALUES TO YIELD
A RESULT, IS KNOWN AS A ____________.

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 * Discuss

 *  Mixed Expression


40. ATTRIBUTES OF AN OBJECT ARE ALSO KNOWN AS

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 * Discuss

 * methods
 * properties
 * classes
 * functions


41. AN OBJECT IS AN INSTANCE OF A:

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 * Discuss

 * parameter
 * method
 * class
 * application


42. WHICH ONE IS NOT THE BASIC ELEMENT OF OOP?

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 * Discuss

 * Class
 * Abstraction
 * BlueJ
 * Polymorphism


43. WHAT IS THE DIFFERENCE BETWEEN A CLASS AND AN OBJECT?

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 * Discuss

 * A class is a blueprint to make an object
 * An object is a blueprint to make a class
 * A blueprint is an object to make a class
 * Blueprint class is an object make a


44. HOW MANY OBJECTS CAN BE MADE FROM A CLASS? 

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 * Report
 * Discuss

 * None, you make classes from objects
 * one
 * As many as you want
 * All of the above


45. WHICH OF THE FOLLOWING CONCEPTS OF OOPS MEANS EXPOSING ONLY NECESSARY
INFORMATION TO CLIENT?

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 * Discuss

 * Encapsulation
 * Abstraction
 * Data hiding
 * Data binding


46. HIDING COMPLEXITY CAN ALSO BE TERMED AS

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 * Discuss

 * Inheritance
 * Overloading
 * Data hiding
 * Abstraction


47. THE PROCESS BY WHICH OBJECTS OF ONE CLASS ACQUIRE THE PROPERTIES OF OBJECTS
OF ANOTHER CLASS IS KNOWN AS

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 * Discuss

 * Polymorphism
 * Inheritance
 * Data Hiding
 * Association


48. WHICH FROM THE FOLLOWING IS A FEATURE THAT ALLOWS US TO PERFORM A SINGLE
ACTION IN DIFFERENT WAYS.

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 * Discuss

 * Abstraction
 * Polymorphism
 * Encapsulation
 * Inheritance


49. POLYMORPHISM RELATED TO :

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 * Report
 * Discuss

 * PPO
 * Class
 * OPP
 * OOP


50. CONDITIONAL OPERATORS DOES NOT RETURN A VALUE

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 * Report
 * Discuss

 * true
 * false


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