访问实例对象的私有字段 [英] Access private field of a instance object

问题描述

我有一个类，其中有一个名为 orbit 的字段（它的类型与我的类 Body 相同>并具有私有修饰符）：

I have a class, which has one field named orbits (it has the same type as my class Body and has the private modifier):

public class Body {

     // I defined it as private field
     private Body orbits = null;

     public Body getOrbits(){
         return orbits;
     }

     public void setOrbits(Body orbits){
    this.orbits = orbits;
     }

     public void capture(Body victim){
        //Why 'victim' can access 'orbits' ?
        victim.orbits = this;
     }
}

在课堂上，我定义了一个名为<$的方法c $ c> capture（身体受害者），其中有一个类型为 Body 的参数。我想知道为什么我可以直接访问实例受害者的私人字段 orbit ？我的意思是该字段是 private ，是不是通过实例受害者无法访问？

In the class, I defined a method named capture(Body victim), which has one parameter with type Body. I am wondering in the method why I can directly access the private field orbits of instance victim ? I mean the field is private , isn't it non-accessible through the instance victim?

推荐答案

隐私不是每个实例 - 它是每个类。

Privacy is not per instance - it's per class.

该类可以访问所有实例的私有字段。

The class can access the private fields of all instances.

例如，方法 equals（Object o）可以将o（如果适用）转换为相同的类型，并将其私有成员与调用equals（）的对象进行比较。

For example, the method equals( Object o ) can cast o (if appropriate) to the same type, and compare its private members with the object on which equals() was called.

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