Which method must be defined by a class implementing the
java.lang.Runnable interface? public void run() public void
start() void run(int priority) Answer: Option B Option B is
correct because in an interface all methods are abstract by
default therefore they must be overridden by the implementing
class. The Runnable interface only contains 1 method, the void
run() method therefore it must be implemented. Option A and D
are incorrect because they are narrowing the access privileges
i.e. package(default) access is narrower than public access.
Option C is not method in the Runnable interface therefore it is
incorrect.