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→1. Create the Service Interface
'''1.2. Create Interfaces'''<br/>
Add a package to the src folder in your project.Then Add following ttems items to your package:
# A Java class named BusRoute.
# A Java class named BusRouteNotFoundException which extends java.lang.Exceptions class.
# A Java class named InvalidNumberOfSeatsException which extends java.lang.Exception class.
# An Interface named Ticketing
:'''BusRoutNotFoundException Class:'''
:[[Image: 7CreateNewClass.jpg | 700px]]
:'''InvalidNumberOfSeatsException Class:'''
:[[Image: 71CreateNewClass.jpg | 700px]]
:'''Ticketing Interface:'''
:[[Image: 8CreateInterface.jpg | 700px]]