Prototype

Prototype:( copy)

Def: 

• Specify the kinds of objects to create using a prototypical instance, and create new objects by copying this prototype. 
• Co-opt one instance of a class for use as a breeder of all future instances. 
• The new operator considered harmful.

當需要產生的物系眾多時

可以考慮用這個pattern

會比用new  來的快

在factory pattern 及object pool 中
可以考慮這個pattern
來增加程式執行速度