#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

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
for(int j=0;j arr[0].length;j++){
}
}

using enhanced for loop:
for(int x[]: arr){
for(int y:x){
}
}

general syntax for enhanced for-loop
for(dataType singleDimension[]: twoDimension){
for(dataType element: singleDimension){
}
}

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[Abbydups]

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[elikmtl]

The best explanation ever! Thank you very much.

[MdKamrulIslam-loxn]

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.

[egor_andryushchenko]

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

[sentfromheaven]

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

[DarkyBoy-ni]

Yes, I do as you said after watching.

[yashaswinihm]

Normal for loop is better and clear than enhancled for loop

[emerald]

@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?

[GargeyasaikrishnaChava]

I think this topic is less used in daliy life purposes

[praveenr]

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

[manavkaneria]

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

[LAVAN-]

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

[vxiggfy]

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[shaikbasha]

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

[nikilkandula]

Sir can we scanner class to intialise variables

[hwqjrmo]

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

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