Java Programming MCQ Solved Paper for IBPS RRB

1. Declaring a method synchronized guarantees that the deadlock cannot occur.
A. True
B. False
C.
D.
Answer : A

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

3. 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

4. The length of a string object 's1' can be obtained using the expression s1.length.
A. True
B. False
C.
D.
Answer : B

5. Members of a class specified as private are accessible only to the methods of the class.
A. True
B. False
C.
D.
Answer : A

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

7. Connection, Statement are interfaces and ResultSet is a class.
A. True.
B. False.
C.
D.
Answer : B

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

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

10. 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

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

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

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

14. 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

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

16. A class may be both abstract and final.
A. True
B. False
C.
D.
Answer : B

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

18. When we implement the Runnable interface, we must define the method
A. start()
B. init()
C. runnable()
D. run()
Answer : D

19. Give file is a file object, which of the following are legal statements to create a new file.
A. file.create();
B. FileOutputStream fos=new FileOutputStream(file);
C. FileInputStream fis=new FileInputStream(file);
D. all of the above
Answer : B

20. The default case is always required in the switch selection structure.
A. True
B. False
C.
D.
Answer : B

21. 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

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

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

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

25. executeUpdate(------------) returns ___________
A. Nothing
B. Returns a ResultSet object
C. Returns an integer value to show the no. of updated rows
D. None of the above.
Answer : C

26. 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

27. 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

28. It is perfectly legal to assign a subclass object to a supper class reference.
A. True
B. False
C.
D.
Answer : A

29. A JSP file can be stored_________________
A. With the extension .jsp in servlets folder of the jws
B. With the extension .html in public_html folder of the jws
C. With the extension .jsp in public_html folder of the jws
D. None of the above.
Answer : C

30. A variable declared inside the for loop control can not be referenced out side the loop.
A. True
B. False
C.
D.
Answer : A

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

32. Java always provides a default constructor to a class.
A. True
B. False
C.
D.
Answer : B

33. 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

34. 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

35. 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

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

37. Which of the following control expressions are valid for an if statement?
A. an integer expression
B. a Boolean expression
C. either A or B
D. Neither A or B
Answer : B

38. 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

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

40. 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

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

42. JdbcOdbcDriver is an object of Object class
A. True
B. False
C.
D.
Answer : B

43. 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

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

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

46. 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

47. 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

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

49. 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

50. 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