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PengPengCheung
JavaDesignPattern
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JavaDesignPattern
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src
/
visitorpattern
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Element.java
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master
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JavaDesignPattern
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src
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visitorpattern
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Element.java
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package
visitorpattern
;
/*
* 元素类,一般要用访问者模式的时候,元素类接口及其具体实现类应该是基本确定不变的数据结构
* 如果元素类及其子类经常变化的话,定义在这个元素类中的Visitor类中的方法也要经常变化,而且每一个与具体实现类有关的Visitor都要改变,变动太大,不利于维护
* 因此访问者模式适用于已确定数据结构并且不经常变化的系统,而不适用于经常更改数据结构的系统
* */
public
abstract
class
Element
{
public
abstract
void
accept
(
Visitor
visitor
);
}
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