Why Java needs clone interface?# Java - 爪哇娇娃
g*g
1 楼
Folks, I am confused when one needs to implement clone interface
in java, can't java just copy memory like C++?
in java, can't java just copy memory like C++?
c*t
2 楼
You can't do copy memory on a DAG. The result would be a tree.
You can't copy undirected graph or direct graph w/ circular
structures.
【在 g*****g 的大作中提到】
: Folks, I am confused when one needs to implement clone interface
: in java, can't java just copy memory like C++?
You can't copy undirected graph or direct graph w/ circular
structures.
【在 g*****g 的大作中提到】
: Folks, I am confused when one needs to implement clone interface
: in java, can't java just copy memory like C++?
m*t
3 楼
IMHO, the actual reason is Java has to let the programmer decide
whether to make deep or shallow copy while cloning. In some cases,
a hybrid of deep and shallow copy is also possible.
Also, while it's not hard for Java to provide a generic clone utility,
it would have to be based on reflection (similar to how serialization
works), which could be faily expensive operations.
whether to make deep or shallow copy while cloning. In some cases,
a hybrid of deep and shallow copy is also possible.
Also, while it's not hard for Java to provide a generic clone utility,
it would have to be based on reflection (similar to how serialization
works), which could be faily expensive operations.
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