Java Programming MCQ Solved Paper for JEE Main

1. All methods in an abstract class must be declared abstract.
A. True
B. False
C.
D.
Answer : B

2. The concept of multiple inheritance is implemented in Java by
A. extending two or more classes
B. extending one class and implementing one or more interfaces
C. all the above
D.
Answer : B

3. Which javadoc tag is used to denote a comment for methods parameters?
A. @method
B. @parameter
C. @argument
D. @param
Answer : D

4. It is perfectly legal to refer to any instance variable inside of a static method.
A. True
B. False
C.
D.
Answer : B

5. Which of the following represent legal flow control statements?
A. break();
B. continue(inner);
C. return;
D. exit();
Answer : C

6. Which of the following are the wrapper classes?
A. Random
B. Vector
C. Byte
D. all of the above
Answer : C

7. What does the following line of code do?
TextField text=new TextField(10);
A. Creates text object that can hold 10 rows of text.
B. Creates text object that can hold 10 columns of text.
C. Creates the object text and initializes it with the value 10.
D. The code is illegal.
Answer : B

8. The check box group class is a subclass of the component class.
A. True
B. False
C.
D.
Answer : B

9. With javadoc, which of the following denotes a javadoc comment?
A. //#
B. /*
C. /**
D. //**
Answer : C

10. executeUpdate automatically updates data because___________
A. auto commit is on, by default
B. It performs a hidden commit statement as well
C. Does not commit
D. None of the above.
Answer : A

11. A final class may not have any abstract method.
A. True
B. False
C.
D.
Answer : A

12. Message-Driven beans act as a listener for the Java Message Service API, processing messages synchronously
A. True
B. False
C.
D.
Answer : B

13. Which of the following methods can be used to change the size of a
size() *
resize()
A. component
B. dimension()
C. setSize()
D. size()
Answer : C

14. JSP files creates ________________
A. html files
B. html files and java files
C. java files and class files
D. None of the above.
Answer : C

15. A catch can have comma-separated multiple arguments.
A. True
B. False
C.
D.
Answer : B

16. class.forName(...) creates an instance of java ODBC driver
A. True
B. False
C.
D.
Answer : A

17. When the string objects are compared with ==, the result is true If the strings contain the same values.
A. True
B. False
C.
D.
Answer : B

18. Which of the following command lines options generates documentation for all classes and methods?
A. -protected
B. -public
C. -private
D. -encoding
Answer : C

19. Objects are passed to a method by use of call-by-reference.
A. True
B. False
C.
D.
Answer : A

20. Java is fully object oriented programme.
A. true
B. false
C.
D.
Answer : A

21. Any class may be inherited by another class in the same package.
A. True
B. False
C.
D.
Answer : B

22. A panel can not be added to another panel.
A. True
B. False
C.
D.
Answer : B

23. In the code below, what data types the variable x can have?
A. byte b1 = 5;
B. byte b2 = 10;
C. x = b1 * b2;
D. int short
Answer : D

24. Which key word can protect a class in package from accessibility by the classes outside the package?
A. private
B. protected
C. final
D. don't use any keyword at all(make it default)
Answer : D

25. Submit button always fires doPost(...)
A. True
B. False
C.
D.
Answer : B

26. We can over load methods with differences only in their return type.
A. True
B. False
C.
D.
Answer : B

27. In RMI before running the client program we must start RMI Registry.
A. True.
B. False.
C.
D.
Answer : A

28. It is an error to catch the same type of exception in two different catch blocks associated with a particular try block.
A. True
B. False
C.
D.
Answer : A

29. The programmer must explicitly create the system .in and system .out objects.
A. True
B. False
C.
D.
Answer : B

30. A method declared as static can not access non-static class members.
A. True
B. False
C.
D.
Answer : A

31. What is java -g used for?
A. Using the jdb tool
B. Executing a class with optimization turned off
C. To provided information about deprecated methods
D. Non of the above
Answer : B

32. Consider the following class definitions:

 class maths { 
student student1; 
} 
class student { 
String name; 
} 

This code represents:

A. an 'is a' relationship
B. a 'has a' relationship
C. both
D. neither
Answer : B

33. putValue(...) method takes _____________________-
A. Two arguments of object type
B. First one is of a character type and second one is of an object type
C. First one is of an object type and second one is of a character type
D. None of the above.
Answer : A

34. We would like to make a member of a class visible in all subclasses regardless of what package they are in. Which one of the following keywords would achieve this?
A. private
B. protected
C. public
D. private protected
Answer : D

35. If m and n are int type variables, what will be the result of the expression
'm % n' when m = -14 and n = -3?
A. 4
B. 2
C. -2
D. -4
Answer : C

36. The import statement is always the first no comment statement in a Java program files.
A. True
B. False
C.
D.
Answer : B

37. Which of the following are not keywords?
A. NULL
B. Implements
C. Protected
D. None of the above
Answer : A

38. Which of the following methods can be used to draw the outline of a square?
A. fillRect()
B. drawLine()
C. drawString()
D. all of the above
Answer : B

39. A static class method can be invoked by simply using the name of the method alone.
A. True
B. False
C.
D.
Answer : B

40. forName() is a static factory method
A. True
B. False
C.
D.
Answer : A

41. In evaluating a logical expression of type 'Boolean expression 1&& Boolean expression 2', both the Boolean expressions are not always evaluated.
A. True
B. False
C.
D.
Answer : A

42. Which of the following classes are available in the java.lang package?
A. Random
B. Stack
C. String Buffer
D. Vector
Answer : A

43. Which of the following string can be used as mode string for creating a RandomAccessFile object?
A. "rw"
B. "wr"
C. "0"
D. 'w''
Answer : A

44. Which of the following methods belong to the String class?
A. length()
B. compareTo()
C. substring()
D. all of the them
Answer : D

45. Which are the valid ways to create DataInputStream streams?
A. new DataInputStream(new File("in.dat"));
B. new DataInputStream(new FileInputStream("in.dat"));
C. new DataInputStream("in.dat");
D. new DataInputStream("in.data","r");
Answer : B

46. What is wrong in the following class definitions? 

abstract class print { 
abstract show();
} 
class Display extends print {
}

A. Nothing is wrong
B. Wrong Method show() should have a return type
C. Wrong Methods show() is not implemented in Display
D. Wrong Display does not contain any members.
Answer : C

47. An EJB is a server-side component that encapsulates the business logic of an application
A. True
B. False
C.
D.
Answer : A

48. If you want to assign a value of 99 to the variable year, then which of the following lines can be used within an <applet> tags?
A. number=getParameter(99)
B. <number==99>
C. D. <param = radius value ==99>
Answer : C

49. For all insert, update, delete, query operations on a database, ResultSet object creation is mandatory.
A. True.
B. False.
C.
D.
Answer : B

50. When present, package must be the first no comment statement in the file.
A. True
B. False
C.
D.
Answer : A