Java Programming MCQ Solved Paper for IIFT

1. Java always provides a default constructor to a class.
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. One the features of is that an array can store many different types of values.
A. True
B. False
C.
D.
Answer : B

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

5. Servlet has ___________
A. init method
B. doGet(------) method
C. All of the above methods.
D.
Answer : C

6. The methods wait() and noify() are defined in
A. java.lang.Thread
B. java.lang.Runnable
C. java.lang.Object
D. java.lang.ThreadGroup
Answer : C

7. The name of a Java program file must match the name of the class with the extension Java.
A. True
B. False
C.
D.
Answer : A

8. A string object can not be modified after it is created.
A. True
B. False
C.
D.
Answer : A

9. 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

10. 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

11. 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

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

13. 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

14. 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

15. Which of the following statements are valid array declarations?
A. int number();
B. float average[];
C. double[] marks;
D. counter int[];
Answer : B

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

17. DataInput is
A. An abstract class defined is java.io.
B. A class we can use to read primitive data types.
C. An interface that defines methods to open files.
D. An interface that defines methods to read primitive data types.
Answer : D

18. 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

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

20. 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

21. What is error in the following class definitions? 

abstract class xy { 
abstract sum(int x, int y) {
} 
}

A. class header is not define properly
B. constructor is no defined
C. method is not defined properly
D. no error
Answer : C

22. When we invoke repaint () for a Component, the AWT invokes the method:
A. draw()
B. update()
C. show()
D. paint()
Answer : B

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

24. 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

25. 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

26. 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

27. 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

28. Which of the following are keywords?
A. integer
B. default
C. Boolean
D. Object
Answer : B

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

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

31. 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

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

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

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

35. 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

36. 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

37. 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

38. The expression (x == y && a<b) is true If either x == y is true or a<b is true.
A. True
B. False
C.
D.
Answer : B

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

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

41. Which of the following statements are true?
A. An abstract class may not have any final methods?
B. A final class may not have any abstracts methods.
C. Transient variables must be static.
D. all of the above
Answer : B

42. EJBs can be of the following type(s)
None of the above
A. Entity Bean
B. Session Bean
C. Message-driven bean
D. All of the above
Answer : D

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

44. 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

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

46. 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

47. 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

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

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

50. 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