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.
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.
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.
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 !!!
Going on day 5 of your series coming from 0 java experience. A day ago my program looked like this. import javax.swing.JOptionPane; public class Main { public static void main(String[] args) { String[] toyota = {"97' Celica GT4", "94' MR-2 3SGT", "15' 4-Runner SR5"}; String[] dodge = {"21' RAM 1500 TRX", "18' Dodge Challenger SRT Demon"}; String[] subaru = {"Any turbo Subaru. If you can get a turbo Subaru, get a turbo Subaru. Those things are cool!"}; String make = JOptionPane.showInputDialog("Type in a Vehicle Make to see my opinions on their best versions."); while (make.isBlank()) { JOptionPane.showMessageDialog(null, "Please type in a Make of vehicle. (Toyota, Dodge, Subaru..."); break; } if (make.equalsIgnoreCase("Toyota")) { JOptionPane.showMessageDialog(null,toyota); } if (make.equalsIgnoreCase("Dodge")) { JOptionPane.showMessageDialog(null, dodge); } if (make.equalsIgnoreCase("Subaru")) { JOptionPane.showMessageDialog(null, subaru); } } } to this~! import javax.swing.JOptionPane; public class Main { public static void main(String[] args) { String[][] toyota = new String [2][2]; String[][] dodge = new String [2][2]; String[][] subaru = new String [2][2]; toyota[0][0] = "97' Celica GT4"; toyota[0][1] = "94' MR2 3SGT"; toyota[1][0]="15' 4-Runner SR5"; toyota[1][1]= "20' Camry TRD"; dodge [0][0] = "21' RAM 1500 TRX"; dodge [0][1]= "18' Challenger SRT Demon"; dodge [1][0]= "19' Charger SRT Hellcat"; dodge [1][1]= "21' Viper SRT"; subaru[0][0]= "EVERY"; subaru[0][1]= "SUBARU"; subaru[1][0]= "IS"; subaru[1][1]= "GOOD"; String make = JOptionPane.showInputDialog("Type in a Vehicle Make to see my top 4. Type `all' to view all"); while (make.isBlank()) { JOptionPane.showMessageDialog(null, "Please type in a Make of vehicle, or `all'. (Toyota, Dodge, Subaru..."); break; } if (make.equalsIgnoreCase("Toyota")) { JOptionPane.showMessageDialog(null,toyota); } if (make.equalsIgnoreCase("Dodge")) { JOptionPane.showMessageDialog(null, dodge); } if (make.equalsIgnoreCase("Subaru")) { JOptionPane.showMessageDialog(null, subaru); } if (make.equalsIgnoreCase("all")) {
Hello, just wondering how far are you into your programming journey now? Its amazing how you were able to do this in 5 days.. May I ask how many hours a day were you studying? Thank you and have a nice day.
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
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.
hey bro i have a question.. when we use 2D arrays and we should use 2D arrays instead of a normal array and can we use linked list instead of 2D array or matrix ?
You use 2D arrays when you want an array of arrays. Technically, you could just make a hashmap or just create separate arrays, or even store the contents of a 2D array into a regular array, but sometimes it’s just a bit cleaner to use 2D arrays, I guess (specifically when representing matrices)
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.
@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] )
I understand. but why cant you just make a simple array to have all of them and go through them without having to say String[][] cars = { {"Camaro","Corvette","Silverado"}, {"Mustang","Ranger","F-150"}, {"Ferrari","Lambo","Tesla"} }; Whats the point of defining them like cars [0][0]? Is it just so you can loop through them and change something in there? Like how can you make it so you just define string cars = and then just put the for without going thru each of them 00 01 etc
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
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
2d arrays understood completely. 16th. Thank you, ma Bro Sensei!
best teacher ever.. good job bro
bro!! What is your eclipse theme?? It looks perfect!! Do you know if there is IntelliJ equivalent?
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.
This is important video for multi-dimentional array.
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!
Bro it helped me tommorrow is my exam and was clulessly watching this now
I love watching these videos before class.
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 :)
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?
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.
Thank u Ms.Bro, I'm from Jordan.
Good video, thanks for sharing
Amazing video! Watching all of these to refresh and learn!
Your tutorials are the best!
AMAZING ! BEST TUTORIALS HANDS DOWN !
Nice quick and easy explanation. Great job!
I have smashed that like button so hard, there is a hole is my screen now. Worth it!
Your video helped me a lot! It was the only tutorial that solved my problem. Thank you!
Ooo nice, I wanted one of these.
Nice
you are the best
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"
i have a java final Friday, so thanks for this video!
Good job
You are getting me through QA class man
bro where chalk up u been, it is so cool
This video was so useful!!! Thank you Bro!
simple & great! thanks
very nice explained
Thanks for the lesson
Awesome 👏
cool cars bro
Nice.
Great Job!
Awesome👏👏😊😊
You are the best bro!
Thank you very much for this video
thank you very much
great
Thanx bro
Valuable bro
you are the man!
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.
very meowtastic
Yeah!
👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏
Thanks bro, keep it up💪🏿💪🏿💪🏿
thanks you very much
I kiss your head, dear bro code ! LOVED it ! Thank you !
thanks bro
thx a lot for your help
great video!!! I'm infinitely grateful for your dedication and big heart to share this knowledge with the world. Thank you soo much
thanks, it's so helpful
amazing
So
Public static void main is method
(String [] args) is array???
thx 4 vid bro !
thanks
Thanks you!!
Very usefull
thank you
thee macha lub uuuuuuuuuuuuuuuuu
🐐
Thanks , best explanation !
Gracias brooo
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 !!!
ty bro
Going on day 5 of your series coming from 0 java experience.
A day ago my program looked like this.
import javax.swing.JOptionPane;
public class Main {
public static void main(String[] args) {
String[] toyota = {"97' Celica GT4", "94' MR-2 3SGT", "15' 4-Runner SR5"};
String[] dodge = {"21' RAM 1500 TRX", "18' Dodge Challenger SRT Demon"};
String[] subaru = {"Any turbo Subaru. If you can get a turbo Subaru, get a turbo Subaru. Those things are cool!"};
String make = JOptionPane.showInputDialog("Type in a Vehicle Make to see my opinions on their best versions.");
while (make.isBlank()) {
JOptionPane.showMessageDialog(null, "Please type in a Make of vehicle. (Toyota, Dodge, Subaru...");
break;
}
if (make.equalsIgnoreCase("Toyota")) {
JOptionPane.showMessageDialog(null,toyota);
}
if (make.equalsIgnoreCase("Dodge")) {
JOptionPane.showMessageDialog(null, dodge);
}
if (make.equalsIgnoreCase("Subaru")) {
JOptionPane.showMessageDialog(null, subaru);
}
}
}
to this~!
import javax.swing.JOptionPane;
public class Main {
public static void main(String[] args) {
String[][] toyota = new String [2][2];
String[][] dodge = new String [2][2];
String[][] subaru = new String [2][2];
toyota[0][0] = "97' Celica GT4";
toyota[0][1] = "94' MR2 3SGT";
toyota[1][0]="15' 4-Runner SR5";
toyota[1][1]= "20' Camry TRD";
dodge [0][0] = "21' RAM 1500 TRX";
dodge [0][1]= "18' Challenger SRT Demon";
dodge [1][0]= "19' Charger SRT Hellcat";
dodge [1][1]= "21' Viper SRT";
subaru[0][0]= "EVERY";
subaru[0][1]= "SUBARU";
subaru[1][0]= "IS";
subaru[1][1]= "GOOD";
String make = JOptionPane.showInputDialog("Type in a Vehicle Make to see my top 4. Type `all' to view all");
while (make.isBlank()) {
JOptionPane.showMessageDialog(null, "Please type in a Make of vehicle, or `all'. (Toyota, Dodge, Subaru...");
break;
}
if (make.equalsIgnoreCase("Toyota")) {
JOptionPane.showMessageDialog(null,toyota);
}
if (make.equalsIgnoreCase("Dodge")) {
JOptionPane.showMessageDialog(null, dodge);
}
if (make.equalsIgnoreCase("Subaru")) {
JOptionPane.showMessageDialog(null, subaru);
}
if (make.equalsIgnoreCase("all")) {
for (int i=0; i
Hello, just wondering how far are you into your programming journey now? Its amazing how you were able to do this in 5 days.. May I ask how many hours a day were you studying? Thank you and have a nice day.
THX!
Thank you Bro
Thank you Bro, you gave me an idea how I can solve my code problems 👍🙏
thanks for this
Thank you so much 💙💙💙
Back to the good microphone
❤️👌
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
Thank!!
how to check if the matrix is quare : matrix[n][n]
i miss 3d dorritos
Thanks, Bro! ☕
useful
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.
hey bro i have a question.. when we use 2D arrays and we should use 2D arrays instead of a normal array and can we use linked list instead of 2D array or matrix ?
You use 2D arrays when you want an array of arrays. Technically, you could just make a hashmap or just create separate arrays, or even store the contents of a 2D array into a regular array, but sometimes it’s just a bit cleaner to use 2D arrays, I guess (specifically when representing matrices)
@@perseusgeorgiadis7821 whats the use arrays you can simply write that is print option
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.
6 ferbruar l watched
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!!!!!
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
I understand. but why cant you just make a simple array to have all of them and go through them without having to say String[][] cars = {
{"Camaro","Corvette","Silverado"},
{"Mustang","Ranger","F-150"},
{"Ferrari","Lambo","Tesla"}
};
Whats the point of defining them like cars [0][0]? Is it just so you can loop through them and change something in there?
Like how can you make it so you just define string cars = and then just put the for without going thru each of them 00 01 etc
how would you bubble sort this 2d array