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This article focuses on "how to use abstract classes in Scala". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let the editor take you to learn how to use abstract classes in Scala.

The definition of an abstract class requires the abstract keyword:

The above code defines and implements the abstract method. It is important to note that we put the directly run code in the subclass of App, a trait, and the App internals help us implement the main method and manage the code written by the engineer.

Let's take a look at the use of uninitialized variables in abstract classes:

4. Trait in hands-on Scala

Trait is similar to the interface in Java 8 with default method.

Trait can have either implemented methods or abstract methods, and the way to use trait is to with and blend into the class.

Let's take a look at an example of trait:

Note that we use extends when using trait here, because ConcreteLogger does not inherit other classes or trait

The child trait can override the method that implements the parent trait:

If the child trait overrides a method already implemented in the parent trait, you must use the override keyword:

Here's how to mix trait into an object:

At this point, I believe you have a deeper understanding of "how to use abstract classes in Scala". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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