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Given 100 doors, all are closed initially, with each iteration, the current state of the door will be reversed or toggled, ie if the door is closed then it will be opened and if open then will be closed. The door visited will be dependent if it's multiple of the current iteration. For example in 1st iteration, all the doors will be visited (#1, #2, #3, #4, #5), in 2nd iteration only multiple of 2 doors (#2, #4, #6, #8, #10) will be visited, in 3rd iteration all the multiple of 3 doors (#3, #6, #9, #12, #15) will be visited and so on.

Spring Data is spring way to provide a consistent, Spring-based java persist API for data access while hiding the boilerplate code.

A method needs to be tested for multiple scenarios, multiple scenarios will have multiple test case methods, we may require to test a particular type of scenario only not the entire test suit. for this, JUnit 5 provides @Tag annotation to structure them accordingly. we can tag multiple test cases or test classes.