01、抽象类 在 Java 中，通过关键字 abstract 定义的类叫做抽象类。Java 是一门面向对象的语言，因此所有的对象都是通过类来描述的；但反过来，并不是所有的类都是用来描述对象的，抽象类就是其中的一种。

An abstract class in Java is a class that cannot be instantiated and is intended to be subclassed by other classes. Abstract classes can contain abstract methods, which are methods that are declared ...

Java interfaces are different from classes, and it’s important to know how to use their special properties in your Java programs. This tutorial introduces the difference between classes and ...

Difference between abstract class and interface in java 8 :to create abstract classes we use the 'abstract' keyword whereas keyword 'interface' is used to make the interfaces in java.for inheritance ...

Interface with default methods in java 8in later version of java interfaces always contained only method declaration. we are not giving method definition in the interfaces because java did not allow ...

The Java Tutorial goes on to list bullets for when an abstract class should be considered and for when an interface should be considered. Unsurprisingly, these are derived from the previously ...