getter与setter与成员之间的JAXB注释之间的区别是什么？

标题说明了一切。

我想知道放置JAXB注释之间的主要区别（如 @XmlElement ）在field / getter / setter上。在我看来（在简单的情况下）并不重要。

I would like to know what is the principial difference between putting JAXB annotation (like @XmlElement) on field / getter / setter. It seems to me that (in simple cases) it does not matter.

例如。让我们拿这个

class A  {
    private String a;

    public String getA() { return a; }

    public void setA(String a) { this.a = a; }
}

现在在我看来，如果我把 @XmlElement 。它只是编组好的。当我需要做出改变并且它确实重要时，是否有任何用例？

now it seems to me that it does not matter if I put @XmlElement on member field or on getter / setter. It just marshalls ok. Are there any usecases when I need to make difference and when it does matter?

当我去解组这个（xml回到A）JAXB具体做什么？

When I go to unmarshall this (xml back to A) what JAXB does specifically?

我正在使用JAXB MOXy实现

I am using JAXB MOXy implementation

谢谢