java method reference

I can never remember the syntax for passing a method reference in Java, so I'm pasting a note about it here.  Here is a decent link explaining the idea.

Here is a method that accepts a method reference as a parameter, and calls that method in its body:

protected ItemDomainEntity findByPath_(String path, Function<ItemDomainEntity, ItemDomainEntity> parentGetterMethod) {

    <snip>
    ItemDomainEntity candidateParent = parentGetterMethod.apply(candidateItem);
    <snip>

}

And then an example of calling that method:

findByPath_(path, ItemDomainMachineDesign::getParentMachineDesign);