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
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.
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.
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
There are too many things need to understand, such as collections , list, especially Linkedlist, it is abstract. And tree map. I don’t understand what is tree map. In Chinese they say a word 红黑树 , which means red and black tree style to store hash code.
Bro Code because if you use different color to mark a tree map, it will be more easy to find a certain hash code I think. For example base level is black, and second level is red, and third level is black. But I am also don’t know, why it is called black and red tree.
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
Every time I watch these videos I am reminded that going to school is overrated … if only my teachers are this clear🤧🤧🤧
Love from Germany
Clear explanation as always bro. Thank you this helped me with my assignment.
Thank you. Your videos deserve way more atention!
That was what I really need to understand! Hashmap in java!
Clear, succinct, and complete. Thank you for that.
succ int
I like your time traveling, :D. Thanks for the videos
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.
a comment for the sake of defeating the algorithm.
Easy and smooth as always
Thanks a lot bro
Thank you for this video.
Very clear and straight forward
You make coding easy even though I'm mostly learning in theory and writing on pen and paper
thanks a lot man, crystal clear explanations
Back on the Bro vids. Excellent as usual.
One thing that always confuse me more is long explanations, I really appreciate how you make this simple and straightforward
Thank you so much for the easily understandable explanation!
So simple 👌
Great video. Thanks bro
Good thing future bro popped in, I was confused AF and doubting myself.
Great video.
Allways perfact explanation❤
It's an Arraylist with objects as indecies.
bro this is awesome wou put things down so concisely
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
Great Job!
Tqs for cleaning my mind with HashMap doughts😊😊
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.
Thank you for all your efforts
really really nice！
Good one...simple and easy explanation...thank you bro 🙂
I too, think about Hashbrowns alot.
really easy. thanks for goos explanation.
Great explanation
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.
Outstanding bro sir
Thank you bro!!!
Hello is there a playlist for hash map , linked list , stack , Queue ? Thanks for your time.
Nice, bro!
godly explanation.
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.
A hashmap is not a list where you push elements at the end. Watch a video of a implementation of this method so you know more about it
could you make course of dsa which you implement code manually
me: Searches how to make a hashmap and clicks on a vid
also me: *INSTANTLY CLICKS ON ANOTHER HASHMAP VID CAUSE ITS BRO CODE*
How do you check if a key value pair exists in the hashmap?
I.e if capital of India is new Delhi?
Thank you
I LOVE THIS!
wonderfull
Can you do a video about Treemap ?
Nice time-travel 🙂
Thanks bro
Love From India😁😁😁😁
Nice video
this was great
You're the best Bro
Keep it up
Yea!!
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.
thanks bro!
Bro is a hero❤❤
OUR BRO CAN TIME TRAVEL!!!
Thank You bro
❤️From India.
Great
Thanks
love you bro
Thanks bro🙂
thanks bro
I took tree speps I smashed the butten, subscribed and yes I`d like to become a fello bro ;)
Have you ever eaten grass? Because you are the GOAT! :)
Thanx
I Helped You.... 😊
Nice
you make it too easy to understand
Burger -> Patty
Pizza -> Cheese
Chapati -> Wheat
Spring Roll -> BBQ
you're the bro
the best coding youtuber
as allWays: Amazing
😎💪🏾💪🏾
💪
time travelling ,
Hey guys its bro from the future.
gracias
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
Broo what about HashSet???
brooo why do u use da eclipse, intellij is the alpha bro tool
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
USA goes ROgue!!lol
i need to learn how to combine hashsets and int ch = sc.jscnext()
5:49 This aged well.
what is with the music behind
Ly bro 5
Like
dropping comment
There are too many things need to understand, such as collections , list, especially Linkedlist, it is abstract. And tree map. I don’t understand what is tree map. In Chinese they say a word 红黑树 , which means red and black tree style to store hash code.
I wonder why it's called "red and black tree". That is an interesting translation
Bro Code I think he wants a video of a Red-Black tree with code.
Bro Code because if you use different color to mark a tree map, it will be more easy to find a certain hash code I think. For example base level is black, and second level is red, and third level is black. But I am also don’t know, why it is called black and red tree.
Calibre Yes! It is red-black tree. Sorry.
ok
USA = Washington DC
China = Beijing
Russia = Moscow
India = New Delhi
loved having an assignment at the end 😃
8:50 imagine if the USA’s capita was Detroit 😂
😹
time to go back to the present
commenting, as it is my duty
down below