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Parsing Java Abstraction of the Difference Between Classes and

Interfaces

In Java language, abstract scale-up and with support class abstraction definition of

two mechanisms. Because of these two kinds of mechanism of existence, just gives Java

powerful object-oriented skills. Abstract scale-up and with between classes abstraction

definition for support has great similarities, even interchangeable, so many developers into

line non-abstract class definition for abstract scale-up and it is becoming more casual with

choice. In fact, both between still has the very big difference, for their choice even

reflected in problem domain essence of understanding, to design the intentions of the

understanding correctly and reasonable. This paper will for the difference analysis, trying

to give a developer with a choice between them are based.

Understand class abstraction

Abstract class and interface in Java language is used for abstract classes (in this article

non-abstract class not from abstract scale-up translation, it represents an abstract body, and

abstract scale-up for Java language used to define class abstraction in one way, please

readers distinguish) defined, then what are the abstract classes, use abstract classes for us

any good?

In object-oriented concept, we know all objects is through class to describe, but in

turn not such. Not all classes are used to describe object, if a class does not contain enough

information to portray a concrete object, this class is abstract classes. Abstract classes are

often used to characterization of problem field in our analysis, design that the abstract

concepts, is to the series will look different, but essentially the same exact conception of

abstraction. For example: if we carry out a graphical editing software development, will

find problem domain exists round, triangle so some specific concept, they are different, but

they all belong to shape such a concept, shape this concept in problem domain is not exist,

it is an abstract concept. Precisely because the abstract concepts in problem field no

corresponding specific concept, so to characterization abstract concepts non-abstract class

cannot be instantiated.

In an object-oriented field, mainly used for class abstraction types hidden. We can

construct a fixed a group of behavior of abstract description, but this group of behavior but

can have any a possible concrete implementation. This abstract describe is abstract classes,

and this an arbitrary a possible concrete realization is behaved for all possible derived

class. Modules can be operating an abstract body. Due to the module dependent on a fixed

abstraction body, so it can are not allowed to modify, Meanwhile, through the abstract

derived from the body, also can expand the behavior of this module function. Familiar with

OCP readers must know, object-oriented design to be able to achieve a core principle OCP

(Open - Closed flying), class abstraction is one of the key.

From the perspectives of grammar definition abstract class and interface

In grammatical perspective, Java language for abstract scale-up and with gives

different definitions below to define a way, called produce professional Demo abstract

class as an example to illustrate the difference.

In the abstract scale-up manner, produce professional Demo can have their own data

members, also can have the members of the abstract method, and with the realization of the

way, produce professional Demo can have only static cannot be modified data members,

all the members of the methods is abstract. In a sense, with a special kind of abstract class.

From programming, from the perspective of abstract scale-up and with can be used to

achieve "cancel" thoughts make themselves. But in the specific use top still have some

difference.

First, abstract class in Java language suggests is a kind of inheriting relationship, a

class can be used only once inheritance relationship (because Java do not support more

inheritance ZhuanZhu). - However, a class but can implement multiple with. Maybe it is

Java language designers in considering Java for multiple inheritance support of a

compromise to consider it.

Secondly, in the definition of abstract scale-up, we may give methods of default

behavior. But in with the definition of method cannot have the default behavior, to bypass

this limits, must use entrust, but it will add some complexity, sometimes can cause a lot of

trouble.

In class abstraction cannot define the default behavior is there another serious

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内容反馈

yxldr

2023-06-10

作者将抽象类和接口的区别讲得很通俗易懂，容易理解。
7323

2023-06-10

阐述了Java中抽象类和接口各自的特点和优势，对于学习Java的人来说是非常实用的知识。
乔木Leo

2023-06-10

干货很多，适合沉下心来认真学习，有助于提高编程技能。
白羊的羊

2023-06-10

文章切入点准确，让我快速捕捉到重点，没有浪费时间。
明儿去打球

2023-06-10

有些地方可以深入探讨一下，但整体来说可以满足初学者的需求。

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