Home > Technical Interviews > Computer Science & Engineering > Java Programming > Core Questions and Answers
| 41. | What is use of a abstract variable? |
Variables can't be declared as abstract. only classes and methods can be declared as abstract. |
| 42. | Can you create an object of an abstract class? |
Not possible. Abstract classes can't be instantiated. |
| 43. | Can a abstract class be defined without any abstract methods? |
Yes it's possible. This is basically to avoid instance creation of the class. |
| 44. | 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 possible. Class C should provide implementation for all the methods in the Interface I. Since Class C didn't provide implementation for m1 method, it has to be declared as abstract. Abstract classes can't be instantiated. |
| 45. | Can a method inside a Interface be declared as final? |
No not possible. Doing so will result in compilation error. public and abstract are the only applicable modifiers for method declaration in an interface. |
