#94 Map in Java

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In this lecture we will learn:
Map in collection
Syntax for the Map
How to work with key-value pairs in a map?
Properties of Map in Java
Difference between HashMap and HashTable
#1
Map is not an implementation or it does not extend the collection interface. But it is a part of the collection concept.
Map is a collection of key-value pairs. in this, for every value of an element, a key is associated with it.
Map itself is in an interface that supports key-value pairs. A class that implements it is called HashMap.
#2
We can add elements in a map using the put() method that accepts both the key and value of it.
We can get the value of an element by specifying its key of it in the get() method.
Keys are unique but values can be repeated. The value of a key can also be updated.
In a map, keys are in a set while values are in a list.
We can get all the keys by using the method keySet().
We can get the value of a key by using the method get() and pass a parameter as a key in the method.
remove() method is used to delete a particular element or an entity from a map.
#3
We can also use a HashTable instead of using a HashMap.
The difference between HashMap and HashTable is that HashTable is synchronized while HashMap is normal.
If you are working with multiple threads at a time, then it is better to use a HashTable to make it synchronized.
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[@samiahmad5612]

00:03 Map provides a way to associate values with unique keys.
01:22 Using a map to store key-value pairs
02:40 Data types and class for implementing a hashmap
03:53 Map data structure in Java
05:01 Keys are unique, values can be the same
06:19 Print all values using a for loop
07:38 You can print all the values from a map using the get method.
08:55 Hash table and hash map are similar but hash table is synchronized while hash map is not.

[@RaghavSaggu]

I suggest to all viewers to check internal implementation of maps, these data structures are way different than they looks and not discussed even 1% in this video. Though this video gives nice information to start working with Maps.

[@anant8321]

Can you suggest any videos for the implementation purpose ?

[@nuclear_works]

You are doing a great job by saving millions of Student"s Neck.
Thank you very much

[@Mshagy02]

Thank you for this. this is the clearest video I've found on the topic

[@vinayraut4843]

Thank you sir for making such great videos,ur explanations are perfect, I performed good in my practical exams because of uh only ❤️💯

[@kausigayokeshk3160]

00:03 Map provides a way to associate values with unique keys.
01:22 Using a map to store key-value pairs
02:40 Data types and class for implementing a hashmap
03:53 Map data structure in Java
05:01 Keys are unique, values can be the same
06:19 Print all values using a for loop
07:38 You can print all the values from a map using the get method.
08:55 Hash table and hash map are similar but hash table is synchronized while hash map is not.
Crafted by Merlin AI.

[@Edd_Elric]

Thanks for all your content, very nice!

[@AkashAkash-z5x5d]

5:17 😂😂 Funny Sir

[@neoness1268]

Good explanation 👌

[@Kramn-e8f]

THANK YOU i was not understanding this very well

[@jmitmandalia]

Thank you Navin. This course is great.
Can you please also tell me what is the tool you are using to draw the diagram, in colors, in these videos? That is best tonuse for all remote worker like, when work with clients.

[@THEREELCOMMUNITY]

Thanks bud ❤

[@kirusanth]

Just like Associative array in php right sir?

[@ajayghode3602]

Thank you.

[@dustinhicks3329]

At 2:17 you clicked on the Map reference and it pulled up what looks like the java docs for the Map class. Is that an extension that you have installed?

[@nenuanenenuane6645]

no u can just click on map
java classes will open automatically if they are present

[@jaypople8885]

Sir, What if you have 2 or more student of same name in this example? how can we add new one instead of updating previous one.

[@Mshagy02]

Use a more discriptive key. for example use first and last name of the student

[@KrishnenduBiswas-k8s]

dictionary?

[@VeluR-1993]

What if one key has multiple value. How to get the values. Please help.

[@CEEPATHIAARYA]

Map mp = new HashMap();