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This article mainly explains "how to apply Scala abstract classes". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to apply Scala abstract classes.

1 definition of abstract class

Define an abstract class:

If a class has at least one abstract method or one abstract field, the class must be declared abstract.

Abstract class Person {/ / has no initial value, and the abstract field var name:String// has no method body. It is an abstract method def id: Int} class Employ extends Person {var name:String= "Fred" / / implementation, without the overide keyword def id = name.hashCode}

2 the application of abstract class

Define attributes with abstract type members:

Trait Buffer {type T val element: T}

Define an abstract class to increase the upper boundary of the type

Abstract class SeqBuffer extends Buffer {type U / / type T

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