Overhead associated with Exception vs Throwable in Java

Question

I know

throw new Exception();

has a pretty large overhead, since it creates a full stackTrace, etc.
Does

throw new Thr         


        

Answer 1

Nope, you need your own subclass to avoid that effect.

Exception ex = new Exception() {
    @Override public Throwable fillInStackTrace() {
        return this; // and do nothing else
    }
};

This creates an instance of exception that will not fill the stack trace (the creation of exceptions delegates to fillInStackTrace to actually fill the stack trace) and is thus cheap to create.