is a

是一个：在知识表示、面向对象程序设计与面向对象设计的领域里

常用释义

词性释义

是一个：在知识表示、面向对象程序设计与面向对象设计的领域里，is-a（英语：subsumption，包容）指的是在抽象（比如类或类型）之间体现的包容关系。例如类D是另一个类B的子类（类B是类D的父类），则D被包容在B内。换句话说，通常'D is a B'指的是，概念体D物是概念体B物的特殊化，而概念体B物是概念体D物的广泛化。举例来说，水果是苹果、橘子、芒果与其他水果的广泛化。
例句
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I realize this "Part II" is a bit late, but, due to my exams last month, I was unable to find the time to set up a testing machine.
China with an annual per capita income of over $1000 is a middle income country though it was a low income country just a few years ago.
The fact that the medical-industrial complex is trying to shape health care reform rather than block it is a tremendously good omen.
Considering Diablo 3 is a fast-paced game, how much lore is the Blizzard team planning to put in?
The design is a bit adventurous, and for the most part, it works, but it has a few major problems.
a man is a man until the day he dies, but a woman is only a woman as ling as she can.
Draco: What she needs is a man. . . to *dominate* her! To make love to her enough to make her love him! B man like you!
That this is a correct theory we are not prepared to maintain, yet certain facts deserve mention which might seem to support it.
The optimization of the capital structure of listed company is a very important thing to the company all over the world.
Software is a form of intellectual property and is entitled to just as much protection as real property like your car or your home.
it is a chronic skin disease and the priest shall pronounce him unclean. He is not to put him in isolation, because he is already unclean.
Human body is a very delicate "machine" and just like any other machines the body it self needs to be maintain in a good condition.
Once upon a time, its lese-majeste would have got them all bundled into the Tower of London, not least because one of them is a woman.
The fact that she is a woman does not guarantee anything, but is nothing negative, either, I have hope that she would do a good job.
This is a bit of a different approach from my last trip since I honestly have no idea when I'm actually coming back "home. "
It is a cruel irony that the euro could be felled by an Italian trying too hard to be a German.
The other is a so-called "survey perspective" , which gives directions as if looking down upon a map.
Scott , a National Rosicrucian Lecturer, writes that the Bible is a spiritual book and must be read with the heart as well as with the mind.
Whether or not you think it's neglect is a different matter: a Newsvine poll posted on Thursday is split almost down the middle.
Saying a group of porcupines is a boar, the body is long to stab of that kind of boar, everyone is crowded to together pass the winter.
It's a fact. However, none of these clubs have been talking to us about him lately. He is a player of VfB Stuttgart.
You thought that now have how much person at is a small bottle water but try very hard to.
网络释义

一个

抽象类表示“是一个（IS-A）”关系的抽象，接口表示“能（CAN-DO）”关系的抽象。 请照例将上面的大声话朗读十遍。

关系

IDEF1x语义建模方法及其在数据库设计中的应用... ... Generic Entity 一般实体 IS-A 关系 Subtype Entity 子实体 ...

类继承

public abstract class Decorator : Tank //Do As，接口继承，不是类继承（Is-A）。这里不是Is-A的关系

一种

奶牛是一种（IS-A）陆地动物。

继承关系

用继承

...ce", 尽量使用合成/聚合(Has-A)，而不是用继承(Is-A)。

类间

接口表述的是“我能做（CAN-DO），抽象类更多的是定义在一系列紧密相关的类间（IS-A），而接口大多数是关系疏松但都实 …

是什么

注意你并没有定义一个“是什么”（IS-A）关系。这儿并没有“雇员”（“Employee”）基本类型；也不需要。
更新时间：2025-05-03 06:16

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