如何将复制构造函数作为方法引用传递？

Question

I have a class PlanItemEditor.

I require the E item's copy constructor. How do I pass it in 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 of including a Unary function as a parameter, and passing in a method from the E class that was exactly a copy constructor, but with a different name signature. It's kind of hacky, however.

Is there a better way of doing this?

Answer 1

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);