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

What would catch the exception and handle it? Let's assume that the run method could throw a checked exception. Then you could write code like this:

Thread myThread = new Thread(aRunnable);
try{
    myThread.start();
}
catch(Exception e){
   e.printStackTrace();
}
//do other stuff

BUT once you call myThread.start, the new thread is started in the background and the current thread continues and exits the try-catch and does other stuff. So if myThread did throw an exception later on, you can't catch it!

What you need to do is deal with the exception within the run method and then probably have a way of notifying another object that this thread failed.