Java Thread: Run method cannot throw checked exception

Question

In Java thread, the \'run\' method cannot throw a \'checked exception\'. I came across this in the Core Java (vol 1) book. Can someone please explain the reasoning behind i

Answer 1

throws declarations are part of the methods signature. To allow checked exceptions for Runnable#run, one had to declare them on the Runnable interface and had to try/catch everytime we start a thread.

Then again, we usually don't call the run method, we just implement it. We start() a Thread and then, somehow, the run method is called.

But the most obvious reason: When we start threads, we usually don't want to wait until the run method terminates just to catch exceptions like this:

try {
   new Worker().start();  // now wait until run has finished
} catch (SomeThreadException oops) {
   // handle checked exception
}