The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. If I implement an Interface, is it called an Inheritance? Ask Question. Asked 5 years, 6 months ago. Active 3 years, 11 months ago. Viewed 17k times. Improve this question.
Benjamin Hodgson 4, 2 2 gold badges 23 23 silver badges 34 34 bronze badges. Possible duplicate of Expressing interface inheritance in natural language — gnat.
Jodrell's comment is simply wrong. Implementing an interface is indeed inheritance, and inheriting one interface from another is inheritance. How do we know? By defining the word we're using. Inheritance is the property that the inheritable members of one type are also members of another type.
By this definition, plainly a class which implements an interface has inherited all the interface's methods; just look at the class and the interface and you'll find that in a correct program, they have the same members.
I have unchecked and left with more confusion. For what it's worth, I think you're spending a lot of time on a word definition that isn't going to yield you much benefit. At the end of the day, we all know what implementing an interface means, and whether it is considered "inheritance" is largely immaterial to your daily work. I mostly agree with Robert.
I think there is real value in understanding the precise technical meanings of jargon words as they are used in various contexts. But Robert is right that it is of far greater benefit to understand the practical impact! How can you use inheritance to make your code safer? More testable? More reusable? More flexible? And so on. Knowing that members of base types are also members of derived types is great, but it is better still to know how to use it effectively.
Show 8 more comments. Active Oldest Votes. What is inheritance? When members of one type X are considered to be members of another type Y, those members of Y are inherited from X. There is an inheritance relationship between some types; that is, for some types X and Y we say "Y inherits from X". These are subtly different.
That is unfortunate because it is confusing. What confusions typically arise from this subtle distinction? In Java, are interface members inherited by classes which implement them? Your class can implement more than one interface, so the implements keyword is followed by a comma-separated list of the interfaces implemented by the class.
By convention, the implements clause follows the extends clause, if there is one. If you want to be able to compare the size of similar objects, no matter what they are, the class that instantiates them should implement Relatable. Any class can implement Relatable if there is some way to compare the relative "size" of objects instantiated from the class. For strings, it could be number of characters; for books, it could be number of pages; for students, it could be weight; and so forth. For planar geometric objects, area would be a good choice see the RectanglePlus class that follows , while volume would work for three-dimensional geometric objects.
All such classes can implement the isLargerThan method. It can have multiple concrete methods. Abstract classes allow you to create blueprints for concrete classes. But the inheriting class should implement the abstract method. An abstract class permits you to make functionality that subclasses can implement or override whereas an interface only permits you to state functionality but not to implement it.
A class can extend only one abstract class while a class can implement multiple interfaces. Skip to content. Report a Bug. Previous Prev. Next Continue. Home Testing Expand child menu Expand.
0コメント