67. Which non-Unicode letter characters may be used as the first character of an identifier? The non-Unicode letter characters $ and _ may appear as the first character of an …
61. Can a Byte object be cast to a double value? No, an object cannot be cast to a primitive value. 62. What is the difference between a static and …
55. What is Externalizable? Externalizable is an Interface that extends Serializable Interface. And sends data into Streams in Compressed Format. It has two methods, writeExternal(ObjectOuput out) and readExternal(ObjectInput in)
49. Why is an Interface be able to extend more than one Interface but a Class can’t extend more than one Class? Basically Java doesn’t allow multiple inheritance, so a …
43. Class C implements Interface I containing method m1 and m2 declarations. Class C has provided implementation for method m2. Can i create an object of Class C? No not …
37. Can we declare a static variable inside a method? Static varaibles are class level variables and they can’t be declared inside a method. If declared, the class will not …
31. How is final different from finally and finalize()? final is a modifier which can be applied to a class or a method or a variable. final class can’t be …
25. Can a class declared as private be accessed outside it’s package? Not possible. 26. Can a class be declared as protected? A class can’t be declared as protected. only …
19. Can a main() method be overloaded? Yes. You can have any number of main() methods with different method signature and implementation in the class.
13. What are instance variables? Instance variables are those which are defined at the class level. Instance variables need not be initialized before using them as they are automatically initialized …
