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What is the advantage of using an abstract class instead of a trait (apart from performance)? It seems like abstract classes can be replaced by traits in most cases.
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The abstract class in Java enables the best way to execute the process of data abstraction by providing the developers with the option of hiding the code implementation. It also presents the end-user with a template that explains the methods involved.
The short answer: An abstract class allows you to create functionality that subclasses can implement or override. An interface only allows you to define functionality, not implement it. And whereas a class can extend only one abstract class, it can take advantage of multiple interfaces.
Trait supports multiple inheritance. Abstract Class supports single inheritance only. Trait can be added to an object instance. Abstract class cannot be added to an object instance.
The only reason for declaring a class as abstract is so that it can't be instantiated. There are situations where you will have common functionality that is shared between a number of classes, but by itself that common functionality does not represent an object or represents an incomplete object.
I can think of two differences
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