Runnable with a parameter?

Question

I have a need for a \"Runnable that accepts a parameter\" although I know that such runnable doesn\'t really exist.

This may point to fundamental flaw in the design

Answer 1

Since Java 8, the best answer is to use Consumer:

https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html

It's one of the functional interfaces, which means you can call it as a lambda expression:

void doSomething(Consumer something) {
    something.accept("hello!");
}

...

doSomething( (something) -> System.out.println(something) )

...