Microservices is a software architecture model.this model consiste
of decomposing a monolith application into multiple smaller services are very
tightly focused on doing one thing and doing it well.Each is individually
deployable and composed then a single application independent from other
services.
Most developers
use maps to store and get data especially HashMaps, but most of theme dont
know how to use it or understand how HashMaps works. in this
post , i'll explain how the java.util.HashMap works , we will
see different examples of HashMap, like adding and removing entries, iterating
over Java HashMap, checking size map, finding if a key or value exists on
Map and various other examples, which we used frequently.
The HashMap class uses a hashtable to implement the Map interface. This
allows the execution time of basic operations, such as get( ) and put( ), to
remain constant even for large sets.
Below given is the list of constructors supported by the HashMap class.
Constructors:
- HashMap( ) : This
constructor constructs a default HashMap.
- HashMap(Map m) : This
constructor initializes the hash map by using the elements of the given
Map object m
- HashMap(int capacity) :This constructor initializes the capacity
of the hash map to the given integer value, capacity.
- HashMap(int capacity, float fillRatio) : This constructor initializes both the capacity and fill ratio of the hash map by using its arguments.
