JDK interface for processing a generic parameter

Question

Is there an interface from the JDK that looks something like this:

public interface Callback<T> {
    public void process(T t);
}

The requirement is to implement a callback that runs code, but doesn't return anything.

I could write my own (by simply using the example code here), but I'd like to use an existing wheel if one exists, rather that reinventing one.

Answer 1

So you need something like

interface Foo<T>
    bar(T)

Only 3 interfaces in JDK are like that

java.nio.file.DirectoryStream$Filter<T>

    boolean accept(T entry) throws IOException;


java.lang.Comparable<T>

    int compareTo(T o);


javax.xml.ws.Provider<T>

    T invoke(T request);

Obviously you won't like them.

Async IO has a callback interface, but it's a bit more complicated:

java.nio.channels.CompletionHandler<V,A>

    void completed(V result, A attachment);

    void failed(Throwable exc, A attachment);

Answer 2

No, I don't believe there's such an interface currently. There's currently slated to be such an interface, called Block (with an apply method, I think), in JDK 8... though the name could well change between now and then.