#29 Multi Dimensional Array in Java

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In this lecture we are discussing:
1)what is multidimensional array?
2)Why do we need multidimension array?
3)How to create multidimension array?
4)How to access element of multidimension array?
5)how to use enhanced for loop and simple loop in multidimension array to traverse array element?
#1
what is multidimension array?
-- simple we can say it is array of array
-------------
| 1 | 2 | 3 |
-------------
| 4 | 5 | 6 |
-------------
Above is example of 2-d array which has 2 rows and 3 columns.
-- it seems to look like a bigger array consist two single dimension array.
-- just like we have 3-d array and array might be n-dimension.
#2
Why do we need multidimension array?
-- to solve some matrix problem to solve grid problem
#3
How to create multidimension in java?
-- different Ways to create array in java
a)Literal notation
Literal notation: int [][]arr = {{1, 2, 3},{4,5,6}};
b)Object notation
int [][]nums=new int[2][3];
-- general syntax for object notation:
-- dataType [][]arrayName=new dataType[rows][columns];
#4
how to access element of multidimension array element?
let we create 2d array arr
int [][]arr = {{1, 2, 3},{4,5,6}};
-------------
| 1 | 2 | 3 |
-------------
| 4 | 5 | 6 |
-------------
-- there are two rows whose index are 0,1 and columns are 0,1,2.
-- want to access 2 which are at row 0 and columns 1
-- System.out.println(arr[0][1]); //give 2
simple if you want to access element at ith row and jth column then;
arr[i][j]; //it is value at that position
#5
How to use enhanced for loop
for array name arr:
-- using for loop traverse all element
-- arr.length give number of rows and arr[0].length give number of column in first row
for(int i=0;i arr.length;i++){
for(int j=0;j arr[0].length;j++){
System.out.print(arr[i][j]+" ");
}
System.out.println();
}
using enhanced for loop:
for(int x[]: arr){
for(int y:x){
System.out.print(y+" ");
}
System.out.println();
}
general syntax for enhanced for-loop
for(dataType singleDimension[]: twoDimension){
for(dataType element: singleDimension){
System.out.println(element);
}
}
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[@ayodhyarode4522]

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[@sarathchandar5047]

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ayoo ayoo

[@cramyboba1013]

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[@elikmtl7730]

The best explanation ever! Thank you very much.

[@praveenr7957]

I run array in vs code it gives something main error. But I run in Eclipse it gives output.

[@sentfromheaven00]

What program do you use to draw the diagrams for us? I really like it

[@egor_andryushchenko]

Thank you for this lesson, I have enjoyed it a lot, reminds me of my time in university with C++.

[@user-ur8rr2uz7z]

после активации бота, подскажите, как можно включить текущую сетку? не могу что то найти кнопку

[@DarkyBoy-n1i]

Yes, I do as you said after watching.

[@MdKamrulIslam-lo9xn]

creating an object of the Random class could also be done here to do the job: Random random = new Random(); nums[ i ] [ j ] = random.nesxtInt(); // put the upper limit inside the nextInt bracket if you want an upper limit.

[@manavkaneria]

What's about if we want to take input from the user?

[@emerald8743]

@Telusko, The main array is 3 rows and one column right? I see there is only one column for main array which has 3 arrays. The four columns are of internal arrays right?

[@LAVAN-2424]

sir why to take random Values teach and insert user given values.

[@yashaswinihm4288]

Normal for loop is better and clear than enhancled for loop

[@samantsrivastava8170]

Yes

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[@sindhisajadali610]

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[@GargeyasaikrishnaChava]

I think this topic is less used in daliy life purposes

[@user-hw4qj1rm3o]

How can we ourself initialize the multidimensional array as we do in 1d array

[@The_Motobikers_World]

Just simply assigned the value in row and column format where row represent the no of array and column represent the no of elements in the array . Just for example first array 0th element we have to write Array[0][0]=some value; Like wise that second array third element supposed the array size is of 3 Then the syntax will be Array[1][3]=some value;

[@The_Motobikers_World]

Another way scanner class should be in a nested loop where outer loop represent the row no(no of array )and inner loop represent the column (no of elements in the array) . The syntax will be:- Arr[row][column]=sc.nextInt();//before that you should include the scanner class in your code and create an object of that .

[@user-vx5ig3gf7y]

broo navin bro thandani thane thane thandane thane thane noo brooo super explanation

[@adityakaushik2845]

Math.random not working in my compiler.why??

[@nikilkandula8562]

First u have to import it's library

[@AravStark]

You have to import it bro

[@lohithareddy15]

@@nikilkandula8562 how can i import math library in vs codde.....can u please help me

[@ArjunU931]

​​@@lohithareddy15 type this code in the first line ok. " import java.lang.Math; ". 😊

[@cosmesumagaysay7126]

​@@lohithareddy15import java.util.Random;

[@shaikbasha3882]

if you are here then i would have kissed on your head man, you just clarified all the doubts which was there from ages ..

[@nikilkandula8562]

Sir can we scanner class to intialise variables

[@The_Motobikers_World]

Yes, scanner class should be in a nested loop where outer loop represent the row no(no of array )and inner loop represent the column (no of elements in the array) . The syntax will be:- Arr[row][column]=sc.nextInt();//before that you should include the scanner class in your code and create an object of that .

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[@mrgold8267]

Why don't we do this: Random rand = new Random(); import java.util.Random; class Main { public static void main(String[] args) { Random rand = new Random(); int[][] arr = new int[5][]; for(int i = 0; i < arr.length; ++i) { arr[i] = new int[rand.nextInt(5,10)]; for (int j = 0; j < arr[i].length; ++j) { arr[i][j] = rand.nextInt(0,10); } } for(int i = 0; i < arr.length; ++i) { for (int j = 0; j < arr[i].length; ++j) { System.out.print(arr[i][j] + " "); } System.out.println(); } } }

[@CHALLENGESTORY]

😂

[@AravStark]

I had a doubt, while typing it in the comments, it was solved 🤣🤣🤣

[@kvelez]

import java.util.Arrays; public class Main{ public static void main(String[] args) { int[][] nums = new int[3][4]; for (int i = 0; i < 3; i++) { for (int j = 0; j < 4; j++) { int random = (int)(Math.random() * 10);//type casting nums[i][j] = random; System.out.print(random + " ");//row limit } System.out.println();//line break } System.out.println();//For each format for (int[] num : nums) { System.out.println(Arrays.toString(num)); } System.out.println();//For each format for (int[] is : nums) { for (int is2 : is) { System.out.print(is2 + " "); } System.out.println(); } } }

[@sindhunayak9354]

Who don't have laptop or desktop And practice with mobile

[@rohitpal73]

Lol 😂😂😂😂