import java.util.HashMap; public class Main { public static void main(String[] args) { // HashMap implements the Map interface (need import) // HashMap is similar to ArrayList, but with key-value pairs // stores objects, need to use Wrapper Class // ex: (name,email),(username,userID),(country,capital)
HashMap countries = new HashMap();
//add a key and value countries.put("USA","Washington DC"); countries.put("India","New Delhi"); countries.put("Russia","Moscow"); countries.put("China","Beijing");
Hi Bro, hope you're doing well Your videos and explanations about Java and many other programming languages you have on the channel are excellent, understandable and very helpful. You make a complicated subject much simpler. I was wondering if you could add to the playlist, videos that explain the interfaces: List, Set, Map. And an explanation of their implementers: HashSet, HashMap, TreeMap, TreeSet, SortedMap, SortedSet, etc.
@@BroCodez theres a big demand for knowledge in the world because most of them cant afford it and want to find free ways to learn .thank you so much for ur videos
I have been studying Java for 6 months, and my university, as much as the lectures try to help, is absolutely useless, especially for someone like me who suffers from learning disabilities, but your videos are amazing... I wish I found it sooner. They teach me things and help me understand in 1-3 days compared to a month and only half understanding it through my university. Thank you so much! I am been acing my tests with your tutorials xd.
When i first heard about Sets and Maps i always thought i'd never use those but they are, in fact, actually easier than actual arrays, i'm kinda mind blown.
At 11:11, why does it not list the hashmap in the same order in which it was created? As always, great video. I started at video number 3 and this is number 76. Plan to do them all. Not just watching, but I'm doing them myself. Loving it. Your consistency in how you explain is remarkable.
3:39 the diamond operator at the end of the instantiation does not need to take in the String values. Java infers the type from the first portion! Hey, I actually know something about Java. Feels good.
every time you say we should like comment and subscribe to defeat the algorithm im like how do i subscribe again TnT bc ive watched like 30 of your videos i can only subscribe once lmao
I have made another variant: Map countries = new HashMap(); countries.put("USA","Washington DC"); countries.put("India","New Delhi"); countries.put("China","Beijing"); for (Map.Entry sentry: countries.entrySet()) { System.out.printf("The capital of %s is %s ", sentry.getKey(), sentry.getValue()); } I think its elegant, cause we receive key and value in-place within Map.Entry instead of "key-before, value-then" principle.
import java.util.HashMap;
public class Main {
public static void main(String[] args) {
// HashMap implements the Map interface (need import)
// HashMap is similar to ArrayList, but with key-value pairs
// stores objects, need to use Wrapper Class
// ex: (name,email),(username,userID),(country,capital)
HashMap countries = new HashMap();
//add a key and value
countries.put("USA","Washington DC");
countries.put("India","New Delhi");
countries.put("Russia","Moscow");
countries.put("China","Beijing");
//System.out.println(countries);
//countries.remove("USA");
//System.out.println(countries.get("Russia"));
//countries.clear();
//System.out.println(countries.size());
//countries.replace("USA", "Detroit");
//System.out.print(countries.containsKey("England"));
//System.out.print(countries.containsValue("Beijing"));
for(String i : countries.keySet()) {
System.out.print(i+"\t"+"= ");
System.out.println(countries.get(i));
}
}
}
thank you for sharing the code in the comments. saves a lot of pausing and rewinding :)
Bro can you make hash table stuff please..
Instablaster
Yeah you have done correctly no mistake
Keep it up😊😊😊
Thanks for really amazing video it's really helpful
Your short and clear explanations helped me a lot! Thank you
a comment for the sake of defeating the algorithm.
I always learn something new from your videos, thank you!
Clear explanation as always bro. Thank you this helped me with my assignment.
Clear, succinct, and complete. Thank you for that.
succ int
Hi Bro, hope you're doing well
Your videos and explanations about Java and many other programming languages you have on the channel are excellent, understandable and very helpful.
You make a complicated subject much simpler.
I was wondering if you could add to the playlist, videos that explain the interfaces: List, Set, Map.
And an explanation of their implementers: HashSet, HashMap, TreeMap, TreeSet, SortedMap, SortedSet, etc.
Every time I watch these videos I am reminded that going to school is overrated … if only my teachers are this clear🤧🤧🤧
very happy to see new java tutorials Bro!
I'll be updating this playlist more often. It seems there's a big demand for Java
@@BroCodez theres a big demand for knowledge in the world because most of them cant afford it and want to find free ways to learn .thank you so much for ur videos
Love from Germany
That was what I really need to understand! Hashmap in java!
THANK YOU VERY MUCH. YOUR VIDEOS WERE REALLY USEFUL FOR BEGINNERS LIKE ME. Once again, thanks, Bro.
I like your time traveling, :D. Thanks for the videos
Back on the Bro vids. Excellent as usual.
Easy and smooth as always
Thanks a lot bro
Thank you. Your videos deserve way more atention!
One thing that always confuse me more is long explanations, I really appreciate how you make this simple and straightforward
me: Searches how to make a hashmap and clicks on a vid
also me: *INSTANTLY CLICKS ON ANOTHER HASHMAP VID CAUSE ITS BRO CODE*
Thank you for this video.
Very clear and straight forward
Good thing future bro popped in, I was confused AF and doubting myself.
I have been studying Java for 6 months, and my university, as much as the lectures try to help, is absolutely useless, especially for someone like me who suffers from learning disabilities, but your videos are amazing... I wish I found it sooner. They teach me things and help me understand in 1-3 days compared to a month and only half understanding it through my university. Thank you so much! I am been acing my tests with your tutorials xd.
You make coding easy even though I'm mostly learning in theory and writing on pen and paper
Have you ever eaten grass? Because you are the GOAT! :)
Great video. Thanks bro
thanks a lot man, crystal clear explanations
When i first heard about Sets and Maps i always thought i'd never use those but they are, in fact, actually easier than actual arrays, i'm kinda mind blown.
Tqs for cleaning my mind with HashMap doughts😊😊
I too, think about Hashbrowns alot.
Great video.
Allways perfact explanation❤
So simple 👌
Bro is a hero❤❤
Good one...simple and easy explanation...thank you bro 🙂
Nice
Love From India😁😁😁😁
OUR BRO CAN TIME TRAVEL!!!
Great Job!
the best coding youtuber
really easy. thanks for goos explanation.
You're the best Bro
Bravo 👏
At 11:11, why does it not list the hashmap in the same order in which it was created? As always, great video. I started at video number 3 and this is number 76. Plan to do them all. Not just watching, but I'm doing them myself. Loving it. Your consistency in how you explain is remarkable.
Nice video
this was great
It's an Arraylist with objects as indecies.
really really nice!
Outstanding bro sir
I took tree speps I smashed the butten, subscribed and yes I`d like to become a fello bro ;)
Thank you bro!!!
Thank you for all your efforts
bro this is awesome wou put things down so concisely
Thank you so much for the easily understandable explanation!
💪
❤️From India.
😎💪🏾💪🏾
Nice time-travel 🙂
Great explanation
Thank you
Burger -> Patty
Pizza -> Cheese
Chapati -> Wheat
Spring Roll -> BBQ
3:39 the diamond operator at the end of the instantiation does not need to take in the String values. Java infers the type from the first portion! Hey, I actually know something about Java. Feels good.
wonderfull
Thanks
Thanx
Great
Keep it up
Yea!!
Nice, bro!
godly explanation.
Thanks bro🙂
Thanks bro
you're the bro
love you bro
you make it too easy to understand
thanks bro!
time travelling ,
Hey guys its bro from the future.
Hello is there a playlist for hash map , linked list , stack , Queue ? Thanks for your time.
time to go back to the present
Ly bro 5
I LOVE THIS!
gracias
thanks bro
5:49 This aged well.
USA goes ROgue!!lol
Thank You bro
Very good, could just write everything in a sout statement, so that we dont waste time talking about how it wont do anything unless we pritn
as allWays: Amazing
Like
could you make course of dsa which you implement code manually
every time you say we should like comment and subscribe to defeat the algorithm im like how do i subscribe again TnT
bc ive watched like 30 of your videos i can only subscribe once lmao
Raphael Morgan You get a free pass my friend
I Helped You.... 😊
USA = Washington DC
China = Beijing
Russia = Moscow
India = New Delhi
loved having an assignment at the end 😃
How do you check if a key value pair exists in the hashmap?
I.e if capital of India is new Delhi?
8:50 imagine if the USA’s capita was Detroit 😂
😹
Can you do a video about Treemap ?
commenting, as it is my duty
dropping comment
I have made another variant:
Map countries = new HashMap();
countries.put("USA","Washington DC");
countries.put("India","New Delhi");
countries.put("China","Beijing");
for (Map.Entry sentry: countries.entrySet()) {
System.out.printf("The capital of %s is %s
", sentry.getKey(), sentry.getValue());
}
I think its elegant, cause we receive key and value in-place within Map.Entry instead of "key-before, value-then" principle.
suck it youtube algorithm
Turkiye = Ankara
China = Beijing
Turk = Samsun
Russia = Moscow
India = New Delhi
Grizzlies = Ja Morant
Warriors = Steph Curry
Wizards = Brad Beal
Bulls = Demar Derozan
Lakers = LeBron James
ok