关联，聚合和组成之间有什么区别? [英] What is the difference between association, aggregation and composition?

问题描述

关联，聚合和组成之间有什么区别? 请在执行方面进行说明.

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，可以定义Foo和Bar的关系

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

关联-我与一个对象有关系. Foo使用Bar

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

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

组成-我拥有一个对象，并且对其生命负责. Foo去世时，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(); 
}

集合-我有一个东西是我从别人那里借来的. Foo去世时，Bar可能会继续生存.

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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