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Difference between HashMap, LinkedHashMap and TreeMap

 LinkedHashMap is an implementation of java.util.Map interface with predictable iteration order (the order of insertion) i.e. LinkedHashMap will iterate in the order in which the entries were put into the map. LinkedHashMap implementation differs from HashMap in the way that it maintains a doubly-linked list running through all of its entries. This linked list defines the iteration ordering, which is normally the order in which keys were inserted into the map. The insertion order is not affected if a key is re-inserted into the map. Performance of LinkedHashMap is slightly below than that of HashMap, due to the added expense of maintaining the linked list. The other two important implementations of Map interface are java.util.HashMap and java.util.TreeMap. They offer mostly the same functionality. The most important difference is the order in which iteration through the entries will happen. HashMap makes no guarantee about the order. The order can even change completely whe...
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mongodb authentication setting

The administrator of the database is the right person for the task of granting, or denying, permissions to users for doing operations with database resources. By using roles, we can specify what action can be done with a resource. Therefore, a role is a privilege granted to a user to do specific tasks with specific resources. Before you enable access control, you should create a user that can then create users and assign roles to them once access control is enabled.This user-admin will then be used to create and maintain other users and roles, so needs to be assigned a suitable role to enable it to do so. I assume you already have admin user set up within you system if not refer hare before proceeding. The role userAdminAnyDatabase in MongoDB gives ability to create users and assign roles to them, but by itself it doesn’t allow the user to do anything else. The superuser role in MongoDB is the root . In the this post i will show how to create, show and delete a user in...
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