关联，聚合和组成之间有什么区别?

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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