design pattern 's question

gorge_an 2001-08-08 12:05:32
about prototype （原型）.
大家好。 在学习design pattern的时候。我对prototype (原型）的具体用途不是很清楚。书上说是为了减少subclass的个数。但是我看好想不是的。希望读过该书的
大虾给我一些提示。希望可以具体的讲一下prototype 的思想！
谢谢了先！
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dbbdggdbbdgg 2001-09-09
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关于Pattern的资料,什么都有

http://www.umlchina.com/Pattern/Newindex1.htm
one_add_one 2001-08-11
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gz
jbtan 2001-08-10
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prototype pattern 的确可以减少subclass的数量，但这是后果，而不是目的。我们不能仅仅因为要减少subclass而使用prototype. 此外，如果创建一个对象是耗时操作的话, 我们使用prototype。例如，一个class A的实例包括一个极为复杂（耗时）的查询，而我们需要在不同的地方使用查询结果（当然，可能要求不同的排序或者字段），那么可以通过“克隆”（deep copy or clone）这个实例来得到新的对象，而不是创建A的subclass（比如，仅仅是排序不一样）, 去重复耗时操作来得到一个新对象。不限于上述。
请指正。
gorge_an 2001-08-10
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ok thank you
!
gorge_an 2001-08-09
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up
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