Part II $-$ Library in java

Based on your understanding of the below class diagram, write the codes for all the classes shown in

the diagram.

Write a test program to exercise all the classes.

You must:

Annotate the code of every class with plenty of comments to make it clear

Copy the code for all of your classes including the test program and paste them here

Provide plenty of screenshots showing all of your classes and lots of examples of what the

output can be

in java, can someone explain how am i supposed to implement the update and create methodes and also what are the notations on the uml diagram, if anyone can write the full code it will be appreciated, thank you