HASHMAP CLASS IN JAVA || MAP INTERFACE || JAVA PROGRAMMING || FOR BEGINNERS

NETHOD LOCAL INNER CLASS :-
https://youtu.be/Y4KMLJv8EL8

JAVA THREAD :-
https://youtu.be/ZpKOZfjyZg4

COMPARABLE AND COMPARATOR INTERFACE :-
https://youtu.be/7NhmSHnt92Y

DOWNCASTING :-
https://youtu.be/kqPYngG5Ixc

The Map Interface :-
A Map is an object that maps keys
to
values. A map cannot contain duplicate keys: Each
key canmap to at most one value. It models the
mathematical function abstraction.

The Java platform contains three
general-purpose Map implementations:

1. HashMap
2. TreeMap
3. LinkedHashMap .

Few characteristics of the Map Interface are:

●A Map cannot contain duplicate keys and
each key can map to at most one value. Some
implementations allow null key and null value like
the HashMap and LinkedHashMap, but some do not
like the TreeMap.

●The order of a map depends on specific imple‐
mentations, e.g TreeMap and LinkedHashMap have
predictable order, while HashMap does not.

●There are two interfaces for implementing
Map in java: Map and SortedMap, and three
classes: HashMap, TreeMap and LinkedHashMap.

HASHMAP IN JAVA :-

The HashMap class enables you to create a collection
in which a value is accessible using the key. HashMap
stores object in an unordered form. The HashMap
class allows one null value for a key and any number of
null values for values.
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