Public, Private, Protected, and default identifiers

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于 2011-12-01 21:33:00 发布

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原文链接：http://www.cnblogs.com/backpacker/archive/2011/12/01/2271188.html

本文详细解释了私有(private)、受保护(protected)和公共(public)等访问修饰符的作用范围。私有成员只能在类内部访问；受保护成员允许在类及其子类中访问；而公共成员则可以在任何地方访问。没有指定访问修饰符的成员默认为包级可见，即仅在同一包内的类可以访问。

Private methods/properties (priviate int a;) can’t be accessed from outside of the class.
Protected (protected int a;)can be accessed in the class or from its sub-class.
Public (public int a;)can be accessed from any places.
The methods/properties without any identifier (int a) can be access by the classes within the same package; but can’t be accessed out of the package.

In a class, all identifiers can access each other. So in fact “identifier” is for “external” access.

转载于:https://www.cnblogs.com/backpacker/archive/2011/12/01/2271188.html