Question

Help with Java questions and please explain all your answers throughly.

The following three (3) questions are related. 12. Briefly deseribe the effect of the final modifer on methods. 13. Briefly describe the effect of the static modifier on methods. 14. Can a method be both final and static? Explain

Answer 1

Answer 12)
A method declared with final modifier can not be overridden in sub classes.

Answer 13)
A method declared with static modifier can be accessed using the class name and no instance variable is needed to access the method. Also since the static method is accessed using class name and not specific object, a static method can only access static class members(variables/ methods) and not instance members(variables/methods)

Answer 14)
A method can be declared with static and final modifiers. Such methods can not be overridden in subclasses

Answer for 15) needs more details on the assignment

Answer 16) False
The java.util.Map is not a sub-interface of java.util.Collection. A Collection is just a group of objects, whereas a map is a group of key-value pairs. So there is a mapping between key and values. A Collection does not have the concept of keys but only some values are stored in it. Hence the Map interface does not implement the Collection interface