Question

Is there an interface in Java similar to the Callable interface, that can accept an argument to its call method?

Like so:

public interface MyCallable<V> {
  V call(String s) throws Exception;
}

I would rather avoid creating a new type if there already exists something that I can use. Or is there a better strategy to having multiple clients implement and plug in a callable routine?

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Answer 1

Since Java 8 there is a whole set of Function-like interfaces in the java.util.function package. The one you’re asking for specifically is simply Function.

Prior to Java 8, there was no general-purpose, built-in interface for this, but some libraries provided it.

For example Guava has the Function<F,T> interface with the method T apply(F input). It also makes heavy use of that interface in several places.