Java: Create Instances based on prototype

Question

How can I, and What is the best/proper way (ie, most performant and clearest syntactically) in Java to create object instances based on a prototype object instance, when this will occur repeatedly and in a performance critical code path?

I have thought about cloning via a cloning support library, but is that the best/only way? (These need to be arbitrary objects, btw, not ones that implement Clonable).

To clarify what I mean: I have an existing instance of Class T, which has fields set on it, and I want to pop out many versions of the same object to use separately, with the best performance and syntactic clarity possible.

Thanks.

@AdamSkywalker I tried to make that clear with "best performance and syntactic clarity" — mtyson, Mar 07 '16 at 20:30
@JBNizet Except it requires the classes to support the prototype constructor, which I don't want to require. — mtyson, Mar 07 '16 at 20:47

score 1 · Accepted Answer · edited May 23 '17 at 10:28

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Create a builder, which receives this class instance:

Person newOne = new PersonBuidler(oldOne).setAge(42)

Implementation of this builder may use apache common BeanUtils for cloning Java Beans or some other utility library for cloning arbitrary class. See How do I copy an object in Java?

edited May 23 '17 at 10:28

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answered Mar 07 '16 at 20:15

Pavel Bernshtam

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Java: Create Instances based on prototype

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