This lookup takes time which is not needed for resolving abstract class method executions. abstract class: Abstract class cannot refer lambda expression. Interfaces are Slow compared to Abstract classes because in resolving function calls made to an interface instance, JVM requires to lookup in virtual tables to know exact method of implementation class. That is not allowed, so you get a compile-time error. Interface: Interfaces cannot have instance and static blocks. Another thing that came to my mind is when you expect to add common. You can define an abstract method to be protected, and hence not part of the public API of the class. But when you try to override it with a final field in the derived class, you're no longer providing an implicit setter, now your derived class would no longer implement the base class's required interface (and therefore the derived class would no longer substitutable where the base class is expected). If by '100 abstract class' you mean 'abstract class with no concrete methods', then I can think of a reason: visibility. First-class hooks API Tiny bundle: only 7.6kB (2.8 gzipped) Full SSR support: see graphql-hooks-ssr. Therefore your base class provides an interface with getters and setters. A final field is implicitly equivalent to providing a getter with no setter. In Dart, a non- final field is implicitly equivalent to providing a getter and a setter with that field's name.
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