Discussion
Sample26 is run - what will be the output?
public class Sample26 extends Thread
{
private final String label = "report";
private int calls;
public void run(String prefix)
{
calls++;
System.out.println(prefix + label + calls);
}
public static void main(String[] args) throws InterruptedException
{
Sample26 task = new Sample26();
task.start();
task.join();
System.out.println("finished " + task.calls);
}
}
Answer: B
Adding a parameter creates an overload, not an override, so Thread's own no-argument run() is what start() invokes. That inherited method has no Runnable to delegate to and does nothing, so the counter is never incremented and only main's line appears. @Override on the method would have turned the mistake into a compile error.
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