shows the UserManagement class that contains the main method of program. It creates and adds several users, allows the user to search for them interactively, and then prints all of the users in the collection.  Demonstrates the use of a map to manage a set of objects.Creates and populates a group of users. Then prompts for interactive searches, and finally prints all users.use java

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.