According this question Write Program about Travel Agency System.

In this phase you need to identify all classes involve, attributes and behaviours of the object(s). View your system using class diagram and use case diagram. Explain all classes and all relationships between object(s) of the class. Phase 3: Implementation Due date : 18 December 2020 5:30 pm Marks: 10 In this phase student need to write a Java program implements all methods in the class that you have written previously in phase 1 and phase 2. The program must include the implementation of basic algorithms; maximum, minimum, counting, average and searching. The classes have produced in this phase should implementing the concept of inheritance, polymorphism, interface. Here student must add the array attribute (and other necessary attributes. Write all the necessary methods for these additional attributes. Atudent can get the data for the objects from a file. (However, its depending on the problem to be solved, some other data could also be obtained from the user)