How do I pass a copy constructor as a method reference?

Question

How do I pass a copy constructor as a method reference?

I have a PlanItemEditor class.

I need a copy constructor for element E. How can I pass it using a method reference?

public void initValues(ObservableList<E> srcList, E toEdit) {
    indexToSet = srcList.indexOf(toEdit);
    editing = new E(toEdit);
    this.srcList = srcList;
}

I was thinking about including the Unary function as a parameter and passing a method from class E, which was exactly the copy constructor, but with a different name signature. However, this is hacking.

Is there a better way to do this?

+3

java copy-constructor lambda java-8 method-reference

Toni_Entranced 26 Aug '14 at 7:23

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1 answer

assylias · Accepted Answer · 2014-08-26T07:33:56+0000

You can use:

public void initValues(ObservableList<E> srcList, E toEdit, UnaryOperator<E> copy) {
    indexToSet = srcList.indexOf(toEdit);
    editing = copy.apply(toEdit);
    this.srcList = srcList;
}

And you can call it with:

initValues(srcList, toEdit, YourClass::new);

How do I pass a copy constructor as a method reference?

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