Create Collection and generics

Collection and generics

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+collections in java 
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+The Collection in Java is a framework that provides an architecture to store and manipulate the group of objects.
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+Java Collections can achieve all the operations that you perform on a data such as searching, sorting, insertion, manipulation, and deletion.
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+Java Collection means a single unit of objects. Java Collection framework provides many interfaces (Set, List, Queue, Deque) and classes (ArrayList, Vector, LinkedList, PriorityQueue, HashSet, LinkedHashSet, TreeSet).
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+problem with arrays is that we can expand them , for this we can use collections , which acts as a interface . If the number of elements is fixed use arrays or else use collections. 
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+object types in collections is also known as generics, we can perform multiple operations on collections 
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+we can also use list to define integer values
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+we can also use set , but in set we cannot have duplicate values , every element will be unique
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+we get random values in hash set , using tree set we get sorted values in ascending order. 
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+we can also work with map , where we have a key value pair . 
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