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Most people do not understand the knowledge points of this article "Java interface default method format and how to use", so the editor summarizes the following content, detailed content, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this "Java interface default method format and how to use" article.

1. Format of the default method in the API: public default returns the value type, method name (parameter list) {} 2, and notes on the default method in the API:

The default method is not abstract, so it is not overridden. But you can rewrite, and when you rewrite, you can delete keywords.

Public can be omitted, but default cannot be omitted.

3. Examples

1: define an interface MyInterface with two abstract methods:

Void show1 ()

Void show2 ()

2: define two implementation classes of the interface:

MyInterface ImplOne

MyInterface ImplTwo

3: define the test class:

MyInterfaceDemo

In the main method, you create an object in a polymorphic manner and use the

Expansion of knowledge points:

What is an interface (interface overview)

Since the first thing to use an interface is to make clear what an interface is, and what it can help us achieve.

An interface is a specification, which defines a set of rules that reflect the real world "if you are... then you have to be able to..." The mind of. For example, if you are a car, you must be able to run; if you are a bad person, you must bully the good guys.

Interfaces are "abstract" classes that are more abstract than "abstract classes" and can be more standardized to constrain subclasses. Comprehensively and professionally realized: the separation of specification and concrete implementation.

An interface is a reference type in the Java language and a "collection" of methods, so the interior of the interface is mainly defined methods, including constants, abstract methods (JDK 7 and before).

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