1000+ Java Programming MCQ for RBI Assistant [Solved]

1. When X is a positive number the operations x>> 2 and x>>>2 both produce the same result.
A. True
B. False
C.
D.
Answer : A

2. 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

3. 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

4. Consider the following class definition.
Class Student extends String
{
}
What happens when we try to compile this class?
A. Will not compile because class body is not defined
B. Will not compile because class is not declared public
C. Will compile successfully.
D. Will not compile because String is abstract
Answer : D

5. The modulus operator (%) can be used only with Integer operands.
A. True
B. False
C.
D.
Answer : B

6. If a=10 and b= 15, then the statement x =(a>b)?a:b; assigns the value 15 to x.
A. True
B. False
C.
D.
Answer : A

7. DriverManager.getConnection("jdbc:odbc:dsn_name") method does not depend on the class.forName(...) method.
A. True.
B. False.
C.
D.
Answer : B

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

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

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

11. Which of the following statements are true?
A. UTF characters are all 24 bits.
B. Reader class has methods that can read integers and floats.
C. Unicode characters are all 16 bits.
D. all of the above
Answer : C

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

13. Which of the following represent legal flow control statements?
A. break;
B. break();
C. continue(inner);
D. all of the above
Answer : A

14. Which of the following will produce a value of 10 if x = 9.7?
A. floor(x)
B. abs(x)
C. rint(x)
D. round(x)
Answer : D

15. One the features of is that an array can store many different types of values.
A. True
B. False
C.
D.
Answer : B

16. If a=10 and b= 15, then the statement x =(a>b)?a:b; assigns the value 15 to x.
A. True
B. False
C.
D.
Answer : A

17. A Java monitor must either extend thread class or implement Runnable interface.
A. True
B. False
C.
D.
Answer : B

18. 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

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

20. To delete a file, we can use an instance of class file.
A. True
B. False
C.
D.
Answer : A

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

22. When we implement an interface method, it should be declared as public.
A. True
B. False
C.
D.
Answer : A

23. Every method of a final in class is implicitly final.
A. True
B. False
C.
D.
Answer : A

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

25. Which of the following methods can be used to remove a component from the display?
A. remove()
B. desappear()
C. hide()
D. move()
Answer : C

26. Servlet can have ___________
A. get method and post method
B. get method or post method
C. Either of the above
D.
Answer : C

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

28. Which of the following keywords are used to control access to a class member?
A. default
B. protected
C. interface
D. None of the above
Answer : B

29. 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

30. It is an error to have a method with the same signature in both the super class and its subclass.
A. True
B. False
C.
D.
Answer : B

31. Throwing an exception always causes program termination.
A. True
B. False
C.
D.
Answer : B

32. 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

33. In a single Servlet class we can use____________
A. doGet(...) method only
B. doPost(...) method only
C. doGet(...) method and doPost(...) method both at a time.
D. Either 'a' or 'b'
Answer : C

34. 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

35. A constructor must always invoke its supper class constructor in its first statement.
A. True
B. False
C.
D.
Answer : B

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

37. 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

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

39. 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

40. A thread can make second thread ineligible for execution by calling the suspend (-) method on second thread.
A. True
B. False
C.
D.
Answer : A

41. In RMI we invoke client method from remote server
A. True
B. False
C.
D.
Answer : B

42. 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

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

44. It is an error if a class with one or more abstract methods is not explicitly declared abstract.
A. True
B. False
C.
D.
Answer : A

45. Given the code
String s = new String("abc");
Which of the following calls are valid?
A. s.toUpperCase()
B. s.append("xyz")
C. s.setCharAt(1<'A')
D. all of the above
Answer : A

46. An individual array element that is passed to a method and modified in that method will contain the modified value when the called method completes execution.
A. True
B. False
C.
D.
Answer : B

47. All the bitwise operators have the same level of precedence in Java.
A. True
B. False
C.
D.
Answer : A

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

49. 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

50. The use of protected keyword to a member in a class will restrict its visibility as follows:
A. Visibility only in the class and its subclasses in the same package.
B. Visibility only inside the same package.
C. Visibility in all classes in the same package and subclasses in other packages.
D. Visibility only in the class where it is declared.
Answer : C