Java 8 Lambda function that throws exception?

Question

I know how to create a reference to a method that has a String parameter and returns an int, it\'s:

Function         


        

Answer 1

What I'm doing is to allow the user to give the value he actually want in case of exception . So I've something looking like this

public static  Function defaultIfThrows(FunctionThatThrows delegate, R defaultValue) {
    return x -> {
        try {
            return delegate.apply(x);
        } catch (Throwable throwable) {
            return defaultValue;
        }
    };
}

@FunctionalInterface
public interface FunctionThatThrows {
    R apply(T t) throws Throwable;
}

And this can then be call like :

defaultIfThrows(child -> child.getID(), null)