java different types of collections and how they are implemented code example

Example: What kind of collections you used in java?

Selenium List of elements. List of the collection
We have Set Collection Type in our framework. 
Getwindowhandles to handle multiple tabs. 
return type is Getwindowhandles methods is going to return Set. 
For avoid Duplication in Selenium multiple check box, dropdown box. 
We use Set. We get only unique webelements.
Map has not Interface. For key and value. 
List and Set has not a key and value data. 
API testing we are getting data from json file. 
Jason file datas are key and value format.
Data base testing we are using maps. 
If you want to get pairs of data from tables.