Step One : Create Package to make your work standard
Just right click on com.demo.demo then click new -> package
Step Two: Create Entity or Object
Into Entity package right click -> new -> Java Class
Note: You will define your attribute based on need as shown bellow,you can also provide get and set method
Step Three: Create Interface
Interface, is abstracts the operations on data without knowing the details of the underlying data source.
Here we will have two method save() and findAll().
Step Four: Create Implementation of Interface
private List<User> users = new ArrayList<>();
This line ensures that when the UserImplement class is instantiated, the users variable will be a new, empty ArrayList that can be used to store User objects. This ArrayList will dynamically grow as User objects are added to it.
Step Five: create Service Class for logic implementation
Step Six: Create Controller for end-point implementation
Step Seven: Here is how Function main look like
Testing Our Program I will use postman
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Creating User
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Get Users
