Interface and abstract classes
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- The document discusses interfaces and abstract classes in Kotlin, including their differences and usage scenarios. It covers interface declarations and implementations, default interface methods, abstract classes, and the discrepancies between Kotlin and Java interfaces. - Interfaces can provide default method implementations in Kotlin but abstract functions in abstract classes cannot have bodies. A class can extend only one abstract class but implement multiple interfaces. - Interfaces represent contracts while abstract classes follow an "is-a" relationship from a design perspective.
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N.V.Raja Sekhar Reddy
www.technolamp.co.in
Want more...
Like us @ https://www.facebook.com/Technolamp.co.in
subscribe videos @ http://www.youtube.com/user/nvrajasekhar
Interface java
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Interface in java ,multiple inheritance in java, interface implementation
Interface in java ,multiple inheritance in java, interface implementation
Towards Improving Interface Modularity in Legacy Java Software Through Automa...
Towards Improving Interface Modularity in Legacy Java Software Through Automa...
Towards Improving Interface Modularity in Legacy Java Software Through Automa...
Towards Improving Interface Modularity in Legacy Java Software Through Automa...
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Interface and abstract classes
- 1. Interface and Abstract Classes Kotlin Study Group John
- 2. Hi, I am John - Android Developer - Work on Rakuten Viki - Use Kotlin for 2 years - Linkedin: https://www.linkedin.com/in/chang-john-0a95237a/
- 3. Outline - Preface - Interfaces - Default Implementation - Abstract Classes - Difference
- 4. Preface - Be aware the discrepancy of interface between Java(8 later and 8 prior) and Kotlin - Be aware how to implement interface and abstract class between Java and Kotlin - Be aware different between interface and abstract class in Kotlin - Know about scenario of interface and abstract class usage
- 7. Interface - default implementation
- 8. Properties in interfaces Computed Property Property
- 9. Resolving overriding conflicts default implementation C only need to override bar because A already provide default implementation When interface has same signature function, whatever interface has default implementation, D still override explicitly. If D want to call default implementation, use super<T>.function(), like super<A>.foo()
- 10. Discrepancy between Kotlin and Java Kotlin Java 8 Java 8 prior Field Final static via companion object Final static Final static Property(field+accessor) Yes(but no backing field) No No Function abstract/default/static abstract/default/static abstract
- 11. Abstract Classes
- 12. Difference - Interface is stateless(they can’t have a state), abstract class is stateful(they can have a state) - An interface cannot specify a constructor. - Interface can provide default implementation, but abstract function in abstract class can’t have body - A class can extend only one abstract class, but can implement many interface. - From design view, interface is contract and abstract class is “is-a”