Discussion
Sample25 is run - what will be the output?
public class Sample25
{
public static void main(String[] args)
{
Runnable r = () -> System.out.println("go");
r.start();
}
}
Answer: A
Runnable declares run() and nothing else, so there is no start() to call on it; only Thread has that. The lambda itself is fine, since Runnable is a functional interface. Wrapping it as new Thread(r).start() is what launches it.
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