Design Pattern ---- reading big talk design pattern note (2)

9. prototype: Use the prototype instance to specify the type of the object to be created, and copy the objects of the prototype to create rows. UML diagram: The prototype is to create another custom object from one object without any details. . Net to implement the icloneable interface. Generally, when the initialization information does not change, cloning is the best way to hide the details of object creation and improve performance. Memberwiseclone () method. If the field is of the value type, perform a one-on-one copy of the field. If the field is of the reference type, copy the referenced object but do not copy the referenced object, therefore, the original object and the generated copy reference the same object. In light replication, all the variables of the Copied object have the same value as the original object, and all references to other objects still execute the original value. However, pay attention to the special nature of the string type. The character string is non-mutable. It is equivalent to creating a new one after a shallow copy, because if you assign a value to it, it will not change the orientation of the original object, instead, a New String object is created.