True/False Questions for java

1. The name of a Java program fi le must match the name of the class with the extension .java
    A. True                      B. False

2. Two methods cannot have the same name in Java.
    A. True                     B. False

3. The modulus operator (%) can be used only with integer operands.
   A. True                      B. False

4. Declarations can appear anywhere in the body of a Java method.
   A. True                      B. False

5. All the bitwise operators have the same level of precedence in java.
   A. True                      B. False

6. When x is a positive number, the operations x > > 2 and x > > > 2 both produce the same result.
    A. True                     B. False

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

8. In evaluating a logical expression of type
    boolean expression1 && boolean expression2
    both the boolean expressions are not always evaluated.
  A. True                      B. False

9. In evaluating the expression (x = = y && a < b) the boolean expression x = = y is evaluated fi rst and
    then a < b is evaluated.
   A. True                      B. False

10. The default case is always required in the switch selection structure.
      A. True                  B. False

11. The break statement is required in the default case of a switch selection structure.
     A. True                    B. False

12. The expression (x = = y && a < b) is true if ether x = = y is true or a < b is true.
      A. True                  B. False

13. A variable declared inside the for loop control cannot be referenced outside the loop.
      A. True                  B. False

14. Java always provides a default constructor to a class.
      A. True                 B. False

15. When present, package must be the fi rst noncomment statement in the fi le.
      A. True                B. False

16. The import statement is always the fi rst noncomment statement in a Java program fi le.
     A. True                 B. False

17. Objects are passed to a method by use of call-by-reference.
     A. True                B. False

18. It is perfectly legal to refer to any instance variable inside of a static method.
     A. True               B. False

19. When we implement an interface method, it should be declared as public.
     A. True               B. False

20. We can overload methods with differences only in their return type.
      A. True              B. False

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

22. A constructor must always invoke its super class constructor in its fi rst statement.
     A. True                B. False

23. Subclasses of an abstract class that do not provide an implementation of an abstract method, are also
      abstract.
      A. True              B. False

24. Any class may be inherited by another class in the same package.
     A. True               B. False

25. Any method in a super class can be overridden in its subclass.
      A. True              B. False

26. One of the features of Java is that an array can store many different types of values.
     A. True              B. False

27. An individual array element that is passed to a method and modifi ed in that method will contain the
     modifi ed value when the called method completes execution.
     A. True              B. False

28. Members of a class specifi ed as a private are accessible only to the methods of the class.
     A. True              B. False

29. A method declared as static cannot access non-static class members.
      A. True              B. False

30. A static class method can be invoked by simply using the name of the method alone.
       A. True              B. False

31. It is an error, if a class with one or more abstract methods is not explicitly declared abstract.
      A. True               B. False

32. It is perfectly legal to assign an object of a super class to a subclass reference without a cost.
     A. True                B. False

33. It is perfectly legal to assign a subclass object to a super class reference.
     A. True                B. False

34. Every method of a fi nal class is implicitly fi nal.
      A. True               B. False

35. All methods in an abstract class must be declared abstract.
      A. True               B. False

36. When the String objects are compared with = =, the result is true if the strings contain the same
      values.
       A. True              B. False

37. A String object cannot be modifi ed after it is created.
      A. True               B. False

38. The length of a String object s1 can be obtained using the expression s1.length.
     A. True               B. False

39. A catch can have comma-separated multiple arguments.
     A. True              B. False

40. 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

41. Throwing an Exception always causes program termination.
     A. True             B. False

42. Every call to wait has a corresponding call to notify that will eventually end the waiting.
      A. True           B. False

43. Declaring a method synchronized guarantees that the deadlock cannot occur.
     A. True           B. False

44. The programmer must explicitly create the System.in and System.out objects.
     A. True           B. False

45. If the fi le-position pointer points to a location in a sequential fi le other than the beginning, we must
      use the seek method to bring the pointer to the beginning, to read from the beginning of the fi le again.
      A. True             B. False

46. To delete a fi le, we can use an instance of class File.
     A. True              B. False

47. A panel cannot be added to another panel.
     A. True              B. False

48. Frames and applets cannot be used together in the same program.
      A. True             B. False

49. A fi nal class may not have any abstract methods.
      A. True             B. False

50. A class may be both abstract and fi nal.
      A. True             B. False

51. A thread wants to make a second thread ineligible for execution. To achieve this, the fi rst thread can
      call the yield( ) method on the second thread.
      A. True            B. False

52. A thread can make a second thread ineligible for execution by calling the suspend( ) method on the
       second thread.
      A. True           B. False

53. A Java monitor must either extend Thread class or implement Runnable interface.
      A. True           B. False

54. The CheckboxGroup class is a subclass of the Component class.
      A. True          B. False

55. If a frame uses a Grid layout manager and does not contain any panels, then all the components
      within the frame are of the same width and height.
      A. True           B. False

56. With a Border layout manager, the component at the centre gets all the space that is left over, after the
       components at North and South have been considered.
      A. True           B. False

57. The CODE value in an tag must name a class fi le that is in the same directory as the
      calling HTML page.
       A. True           B. False

58. If getParameter( ) returns null, then assigning the return value to a variable of type String may cause
      an exception to be thrown.
      A. True            B. False

59. It is possible to use the File class to list the contents of the current working directory.
      A. True            B. False

60. Reader class has a method that can read and return fl oats and doubles.
      A. True            B. False