To clarify those who don't understand what does cars.length and cars[i].length means, basically: cars.length: detect how many instances/objects are there in the row of the 2D array and cars[i].length: detects how many instances/objects are there in the column of the 2D array
@RestedAura2 you mean the opposite right? cars.length : no of objects in column (vertically/ up to down) or Basically determine no of rows cars[i].length : no of objects in row (horizontally/ left to right) or Basically determine no of columns i was super confused on this topic. correct me if I'm wrong
This is the best Java tutorial for beginners, so you can learn Java and English in one hit. Please keep going! I vote for Java advance tutorial. Thanks a lot Bro
Great vid, although it would have been nice for you to also include how you can access the data within a 2D array and why you would wanna use a 2D array in the first place.
When I was watching your 2d array tutorial it reminded me of Inception and the concept of dreams within a dream. Sounds stupid but it actually works lmao.
Why have cars[i].length in the nested for loop? It doesn't seem to be necessary since it will always be the length of the array anyways. Side note: Love these tutorials, they have all been excellent!
Yes it is not necessary if each row has same number of columns as number of rows, i.e. square array. Let's say if there are 3 rows total, and each row has 3 columns/elements in them, then cars.length = 3, which will work for this case. But, let's say if the array has 3 rows and 2 columns/elements in each row, this logic will break, since again cars.length will be equal to 3, and we know, the third column doesn't exist in any row. So, it's necessary to use cars[i].length as each row is a seperate array in itself. Also, each row can have varying number of columns/elements, which makes it extremely necessary to use the logic. For example consider this array: Tesla, BMW, Audi, Hyundai Mercedes, Volkswagen Range Rover, Buggati, Toyota First row has 4 elements, second row has 2 elements, while the third row has 3 elements.
cars.length is showing the number of instances that there is on that row. In this case that would be 3. That's why the loop keeps going as long as 'i' is lower than cars.length. cars.length = 3 'i' keeps increasing by 1 until it's no longer less than 3. So it goes like: 0, 1, 2. And then it stops, because 3 !< 3, it's equal. The same way, when you type it as cars[i].length, you are getting the number of instances on that column. On this example, that number is still 3, but if you added another row, it would be 4. Using this kind of loop, you make sure you're passing through every instance on your array. It's checking the length of every row on the first loop, and the length of every column on the nested loop. I hope this made sense, if you have any question, ask again and I'll try to clarify it.
@@JusticeBeaver619 Imagine as if he made a variable of Columns and Rows, and assigned the values to each, you could have called that variable in the place of using cars.lenght or cars[i].lenght, which essentially means, "if i is less than Columns" or "if j is less than rows"
Bro, I literally type this out and I get a 1D aka a list. I've been thinking about this for at least 15 minutes without an answer. EDIT: Never mind. I'm a fucking moron. In the last line I wrote sysout + ctrl + space and that's 'System.out.println();' but I need 'System.out.print();'. The 'println' makes a whole new line for each bundle of text forcing the text into a list format. Holy shit I'm happy I'm a stubborn person and figured this out.
i know this is 2 months old; however, this is such a good question that a lot of beginners often ask and want to know. in order to allow a user to create and store their own values in an array, you have to ask yourself one question, “do you want the values stored permanently or temporarily?” meaning, if you want the user to be able to store files in an array they only access while they run their program a single time on your terminal window, then the answer is simple and to code it is even more intuitive and simple. HOWEVER, if you want to allow a user to store values in an array that they create, you are diving into the world of Reading and Writing Files !!! this is awesome to learn !!! implementing this is not entirely simple; however, it does not have to be hard. i don’t have enough characters to type all of the code how. however, i hope i have been able to point you in the write direction to go about learning how to do this !!!
Idk whats happening to my Ide but it isnt becoming 2d but instead its a list idk why but i copy pasted ur code and it become 2d then I typed it again and its still a list :T
Last line needs to be System.out.print(cars[i][j]+" "); NOT System.out.println(cars[i][j]+" "); . Look for the 'ln' before 'print'. That's causing spaces inbetween each bundle of text.
As i undestand, that's used to read the size of the array. So the as long as counter doesn't surpass the size of the array, it will continue to loop around. Once, the counter matches the size or 'length' of the array, it will stop.
I had the same question lol, but i think it's because it's a 2D array.i'm not sur but i think it's to say the length of the row not the column. I will let Bro answer this :p
@TheFakeViRuZz good answer but it's not complete, i think we need to understand the difference between the "Index (i)" and the "Length (cars.length)". When you declare the array of 3 string ( ex : String[ ] cars = new String [3] ) : 1. The length is 3 ( cars.length, returns 3 ) 2. The index goes from "0" to "2" ( cars[0], cars[1], cars[2] )
public class Main {
public static void main(String[] args) {
// 2D array = an array of arrays
String[][] cars = {
{"Camaro","Corvette","Silverado"},
{"Mustang","Ranger","F-150"},
{"Ferrari","Lambo","Tesla"}
};
/*
cars[0][0] = "Camaro";
cars[0][1] = "Corvette";
cars[0][2] = "Silverado";
cars[1][0] = "Mustang";
cars[1][1] = "Ranger";
cars[1][2] = "F-150";
cars[2][0] = "Ferrari";
cars[2][1] = "Lambo";
cars[2][2] = "Tesla";
*/
for(int i=0; i
Wow
To clarify those who don't understand what does cars.length and cars[i].length means, basically:
cars.length: detect how many instances/objects are there in the row of the 2D array
and
cars[i].length: detects how many instances/objects are there in the column of the 2D array
Thanks bro, the loop now makes sense to me, I didn't understand how the j int was smaller than the i int while they were both zero.
thx bro
@RestedAura2 you mean the opposite right?
cars.length : no of objects in column (vertically/ up to down) or Basically determine no of rows
cars[i].length : no of objects in row (horizontally/ left to right) or Basically determine no of columns
i was super confused on this topic. correct me if I'm wrong
@@maximizer174bruh, you got it mixed up. Columns are verticles (top to bottom)
Rows are horizontal (left to right)
@@transfertransfer986 isn't that what i said? 😅
I can't believe I understood this! You have excellent teaching skills.
have been watching ur vids the last few weeks since starting CS in college. they’ve helped so much, thank you
This is the best Java tutorial for beginners, so you can learn Java and English in one hit. Please keep going! I vote for Java advance tutorial. Thanks a lot Bro
System.out.println("Great Video");
Boolean comment = true;
If(comment = true)
{System.out.println("Amen to that");}
@@godcomplex1929error
@@godcomplex1929 your comment is messed up
@@godcomplex1929 comment== true
best teacher ever.. good job bro
2d arrays understood completely. 16th. Thank you, ma Bro Sensei!
I love watching these videos before class.
I did this with pokemon:
public class Array2Ds {
public static void main(String[] args) {
String[][] pokemon = {{"Bulbasaur", "Ivysaur", "Venusaur"},
{"Charmander", "Charmeleon", "Charizard"},
{"Squirtle", "Wartortle", "Blastoise"}
};
//This also works but define it at the top already: String[][] pokemon = new String[3][3];
// pokemon[0][0] = "Bulbasaur";
// pokemon[0][1] = "Ivysaur";
// pokemon[0][2] = "Venusaur";
// pokemon[1][0] = "Charmander";
// pokemon[1][1] = "Charmeleon";
// pokemon[1][2] = "Charizard";
// pokemon[2][0] = "Squirtle";
// pokemon[2][1] = "Wartortle";
// pokemon[2][2] = "Blastoise";
for (int i = 0; i < pokemon.length; i++) {
System.out.println();
for (int j = 0; j < pokemon.length; j++) {
System.out.print(pokemon[i][j]+ " ");
}
}
}
}
nice! That's a good visualization
i love pokemon too
my code is little diffrent but thNK U BRO
love aesthetic code@@BroCodez
This is important video for multi-dimentional array.
Bro it helped me tommorrow is my exam and was clulessly watching this now
dude youre awesome, i really thought this was WAY more complicated :D
Good video, thanks for sharing
Great vid, although it would have been nice for you to also include how you can access the data within a 2D array and why you would wanna use a 2D array in the first place.
Best channel ever!
This is such a helpful and well explained video! Thanks!
Thanks for the help man, this video helped me a lot.
Okay now its etched in my brain Thanks dude :)
When I was watching your 2d array tutorial it reminded me of Inception and the concept of dreams within a dream. Sounds stupid but it actually works lmao.
I have smashed that like button so hard, there is a hole is my screen now. Worth it!
Thank u Ms.Bro, I'm from Jordan.
Your tutorials are the best!
Why have cars[i].length in the nested for loop? It doesn't seem to be necessary since it will always be the length of the array anyways. Side note: Love these tutorials, they have all been excellent!
Yes it is not necessary if each row has same number of columns as number of rows, i.e. square array.
Let's say if there are 3 rows total, and each row has 3 columns/elements in them, then cars.length = 3, which will work for this case.
But, let's say if the array has 3 rows and 2 columns/elements in each row, this logic will break, since again cars.length will be equal to 3, and we know, the third column doesn't exist in any row. So, it's necessary to use cars[i].length as each row is a seperate array in itself.
Also, each row can have varying number of columns/elements, which makes it extremely necessary to use the logic. For example consider this array:
Tesla, BMW, Audi, Hyundai
Mercedes, Volkswagen
Range Rover, Buggati, Toyota
First row has 4 elements, second row has 2 elements, while the third row has 3 elements.
@@udayrajoriyaa thanks for the great explanation!
Awesome👏👏😊😊
great explanation just wondering if i want to make an extra row or colum without out replacing the existing ones how do i do that?
Good job
what is cars.length representive of? like does that mean that I increases until all letters of cars are met or until all the cars are met? thanks
cars.length is showing the number of instances that there is on that row. In this case that would be 3. That's why the loop keeps going as long as 'i' is lower than cars.length.
cars.length = 3
'i' keeps increasing by 1 until it's no longer less than 3. So it goes like: 0, 1, 2. And then it stops, because 3 !< 3, it's equal.
The same way, when you type it as cars[i].length, you are getting the number of instances on that column. On this example, that number is still 3, but if you added another row, it would be 4.
Using this kind of loop, you make sure you're passing through every instance on your array. It's checking the length of every row on the first loop, and the length of every column on the nested loop.
I hope this made sense, if you have any question, ask again and I'll try to clarify it.
@@albertocasanovalaras3153 got it. But can you please explain why we use cars[i].length instead of just cars.length . The value is 3 in both cases
@@JusticeBeaver619 Imagine as if he made a variable of Columns and Rows, and assigned the values to each, you could have called that variable in the place of using cars.lenght or cars[i].lenght, which essentially means, "if i is less than Columns" or "if j is less than rows"
You are getting me through QA class man
Amazing video! Watching all of these to refresh and learn!
Awesome 👏
i have a java final Friday, so thanks for this video!
you are the best
bro!! What is your eclipse theme?? It looks perfect!! Do you know if there is IntelliJ equivalent?
very nice explained
AMAZING ! BEST TUTORIALS HANDS DOWN !
Great Job!
Ooo nice, I wanted one of these.
Your video helped me a lot! It was the only tutorial that solved my problem. Thank you!
This video was so useful!!! Thank you Bro!
Nice
bro where chalk up u been, it is so cool
You are the best bro!
cool cars bro
Thanks for the lesson
Nice.
Nice quick and easy explanation. Great job!
I LOVE THIS GUY
simple & great! thanks
Bro, I literally type this out and I get a 1D aka a list. I've been thinking about this for at least 15 minutes without an answer.
EDIT: Never mind. I'm a fucking moron. In the last line I wrote sysout + ctrl + space and that's 'System.out.println();' but I need 'System.out.print();'. The 'println' makes a whole new line for each bundle of text forcing the text into a list format. Holy shit I'm happy I'm a stubborn person and figured this out.
👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏
Thank you very much for this video
what happens when the arrays have to be inserted by the user instead of assigning the arrays
i know this is 2 months old; however, this is such a good question that a lot of beginners often ask and want to know.
in order to allow a user to create and store their own values in an array, you have to ask yourself one question, “do you want the values stored permanently or temporarily?” meaning, if you want the user to be able to store files in an array they only access while they run their program a single time on your terminal window, then the answer is simple and to code it is even more intuitive and simple.
HOWEVER, if you want to allow a user to store values in an array that they create, you are diving into the world of Reading and Writing Files !!! this is awesome to learn !!! implementing this is not entirely simple; however, it does not have to be hard. i don’t have enough characters to type all of the code how. however, i hope i have been able to point you in the write direction to go about learning how to do this !!!
Valuable bro
Thanks bro, keep it up💪🏿💪🏿💪🏿
So
Public static void main is method
(String [] args) is array???
great
I kiss your head, dear bro code ! LOVED it ! Thank you !
how would you bubble sort this 2d array
great video!!! I'm infinitely grateful for your dedication and big heart to share this knowledge with the world. Thank you soo much
Idk whats happening to my Ide but it isnt becoming 2d but instead its a list idk why but i copy pasted ur code and it become 2d then I typed it again and its still a list :T
Last line needs to be System.out.print(cars[i][j]+" "); NOT System.out.println(cars[i][j]+" "); . Look for the 'ln' before 'print'. That's causing spaces inbetween each bundle of text.
you are the man!
thee macha lub uuuuuuuuuuuuuuuuu
how to check if the matrix is quare : matrix[n][n]
I don’t know what’s wrong with my console, it would display everything straight down and not on the side like his. I need help
very meowtastic
I have a question and would really appreciate anyone's help. I'm not understanding what the "length" is supposed to do in i
As i undestand, that's used to read the size of the array. So the as long as counter doesn't surpass the size of the array, it will continue to loop around.
Once, the counter matches the size or 'length' of the array, it will stop.
thanks, it's so helpful
Why it should be "j
I had the same question lol, but i think it's because it's a 2D array.i'm not sur but i think it's to say the length of the row not the column. I will let Bro answer this :p
amazing
thx a lot for your help
So we can't remove an item within this array?
thank you very much
Thanks , best explanation !
thanks you very much
Thanks you!!
Very usefull
Thanx bro
thx 4 vid bro !
Yeah!
Thank you so much 💙💙💙
❤️👌
thanks bro
6 ferbruar l watched
🐐
Thanks
thanks for this
Thank you Bro
comments for stats!
Thank you Bro, you gave me an idea how I can solve my code problems 👍🙏
Gracias brooo
Someone help me.... why it should be ( int i=0; i
@TheFakeViRuZz good answer but it's not complete, i think we need to understand the difference between the "Index (i)" and the "Length (cars.length)".
When you declare the array of 3 string ( ex : String[ ] cars = new String [3] ) :
1. The length is 3 ( cars.length, returns 3 )
2. The index goes from "0" to "2" ( cars[0], cars[1], cars[2] )
@@shinkanade1552 thanks!!!!!
Thanks, Bro! ☕
ty bro
Back to the good microphone
thanks
👍
bro code please can you explain collection interface and harshmap
useful
Thanks, Bro 06/02/2024