Discussion
Sample74 is run - what will be the output?
public class Sample74 extends Thread
{
static final ThreadLocal<String> SCOPE = new ThreadLocal<>();
public void run()
{
System.out.println(SCOPE.get());
}
public static void main(String[] args) throws InterruptedException
{
SCOPE.set("outer");
Sample74 worker = new Sample74();
worker.start();
worker.join();
}
}
Answer: B
A ThreadLocal holds an independent value per thread and does not pass it on, so the worker has never set one and get returns null, which println renders as the four characters null. InheritableThreadLocal is the variant that copies the creating thread's value.
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