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1.3 the hidden implementation
java has three keywords to set the boundaries: public, private and protected. 【相关文章:CMM中的度量 Measurement】
access control enables users to solve their particular problems without thinking about the inner construction. also, it allows the programmer to update the internal working without worrying about how the change will affect the client programmer. 【扩展阅读:关于组织软件过程财富库-Org Soft】
"friendly" access allows classes to access the friendly members of other classes in the same package. 【扩展信息:配置管理- 功能审计FCA和物理审计PC】
protected acts like private, except that an inheriting class has access to protected members, but not private members.
