关联、聚合和组合有什么区别? [英] What is the difference between association, aggregation and composition?

问题描述

关联、聚合和组合有什么区别?请从实现的角度解释一下.

What is the difference between association, aggregation, and composition? Please explain in terms of implementation.

推荐答案

对于两个对象，Foo 和 Bar 可以定义关系

For two objects, Foo and Bar the relationships can be defined

关联 - 我与一个对象有关联.Foo 使用 Bar

Association - I have a relationship with an object. Foo uses Bar

public class Foo { 
    void Baz(Bar bar) {
    } 
};

组合 - 我拥有一个对象，我对它的生命周期负责.当 Foo 死亡时，Bar

Composition - I own an object and I am responsible for its lifetime. When Foo dies, so does Bar

public class Foo {
    private Bar bar = new Bar(); 
}

聚合 - 我有一个从别人那里借来的对象.当 Foo 死亡时，Bar 可能会继续存在.

Aggregation - I have an object which I've borrowed from someone else. When Foo dies, Bar may live on.

public class Foo { 
    private Bar bar; 
    Foo(Bar bar) { 
       this.bar = bar; 
    }
}

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