a. Write Java class Message that automatically gives each created Message object a unique serial number, starting at 1 for the first message. ( Hint: static ) b) Write statements that create three...

1. a. Write Java classMessage
   that automatically gives each created Message object a unique serial number, starting at 1 for the first message. (Hint: static)

b) Write statements that create three
Message
objects. Show and explain serial numbers for these objects.