Java - BackingStoreException()

Question

I'm a little curious to this exception when being thrown.

  public void addDailyUVReport(DailyUVReport report)
{
        counter++;
        if (counter > CAPACITY)
          throw new BackingStoreException("Called too many times");
}

How come that doesn't work? But... this does.

 public void addDailyUVReport(DailyUVReport report) throws BackingStoreException
  {
    counter++;
    if (counter > CAPACITY)
      throw new BackingStoreException("Called too many times");
  }

I know when you throw an IndexOutOfBoundsException() you do not need the throw clause? and can just create a new one without having the clause with the method. Would it have to do with it being void?

Answer 1

Exceptions which extend RuntimeException are called unchecked and do not need to be declared in the method signature.

See here for more: Difference between Unchecked exception or runtime exception