#30 jagged and 3D Array in Java

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In this lecture we are discussing:
1)What if array of array of different size ?
2)Jagged array concept
3)If i donot know column size of array
4)traverse the array using for loop and enhance loop
#1
Suppose we want to create a 2d dimensional array such that it has
5 rows but we donot know for each row we need different size for column.
for that we go for array of array of different size
-------------
| 1 | 2 | 3 |
---------------------
| 4 | 5 | 6 | 7 | 8 |
-------------------------
| 1 | 5 | 9 | 2 | 4 | 7 |
-------------------------
in above diagram we have three rows and first row has 3 elements
second row has 5 elements and third row has 6 elements.
#2#3
jagged array concept come in java 8
-- Jagged array is a multidimensional array where member arrays are of different size. For example, we can
create a 2D array where first array is of 3 elements, and is of 4 elements. Following is the example demonstrating
the concept of jagged array.
syntax to create --
int nums[][]=new int[3][];
nums[0] =new int[3];
nums[1] =new int[5];
nums[2] =new int[6];
initalize value in array using random()method present in Math class
for(int i=0;i nums.length;i++){
for(int j=0;j nums[i].length;j++){
nums[i][j]=(int)(Math.random()*10);
}
}
#5
Traverse using for loop :
for(int i=0;i nums.length;i++){
for(int j=0;j nums[i].length;j++){
System.out.print(nums[i][j]+" ");
}
}
Traverse using enhanced for loop:
for(int x[]:nums){
for(int y:x){
System.out.println(y);
}
}
Note: Just like 2-d jagged array we can create 3-d , 4-d jagged array
for cursoity:
int num[][][]=new int[3][][];
num[0]=new int[2][];
num[1]=new int[3][];
num[2]=new int[4][];
num[0][0]=new int[2];
num[0][1]=new int[3];
num[1][0]=new int[4];
num[1][1]=new int[5];
num[1][2]=new int[6];
num[2][0]=new int[7];
num[2][1]=new int[8];
num[2][2]=new int[9];
num[2][3]=new int[10];
Intialize the array:
for(int i=0;i num.length;i++){
for(int j=0;j num[i].length;j++){
for(int k=0;k num[i][j].length;k++){
num[i][j][k]=(int)(Math.random()*10);
}
}
}
Traverse the element of array:
for(int i=0;i num.length;i++){
for(int j=0;j num[i].length;j++){
for(int k=0;k num[i][j].length;k++){
System.out.print(num[i][j][k]+" ");
}
}
}
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[@ayashazhar5340]

had a hard time finding a proper video on jagged array and how to update it . thanks bro

[@DevilGaming-bl1og]

In first for loop instead of i

[@29balapraveen]

Can we do jagged array of 2nd dimension in 3 dimensional array?

[@IshmaelSmart-l8v]

I like the way you explain Boss, thanks 😊😊

[@anilkumargangarapu01]

hii, how can we assign fixed values of our own to arrays with different sizes,

[@anilkumargangarapu01]

without using random values,

[@saikiranreddy3558]

@@anilkumargangarapu01 You have to do it in this way (eg. for 2x3 array): array[0][0] = 23; array[0][1]=19; array[0][2]=53; array[1][0] = 08; array[1][1]=91; array[1][2]=63; i.e, you have to assign values manually :p

[@manmohankatyayan5014]

sir how can i get notes

[@sruthigudmella3322]

the notes are in the description 😁

[@SowjanyaKadiveti]

i had tried much more complex one three arrays class demo { public static void main(String[] args) { int num[][][]= new int[3][2][]; num[0][0]= new int[10]; num[0][1]= new int[6]; num[1][0]= new int[2]; num[1][1]= new int [5]; num[2][0]=new int[8]; num[2][1]=new int[8]; for(int i=0;i

[@lisav9566]

Thanks!

[@AdhilMhmdVK]

Three dimensional array with proper example...i couldnt understand this one.

[@pranavsharma5395]

thug life of telusko

[@puruagni1927]

Why are you not updating VS Code? Please update VS Code.

[@thelivereactions]

This video cant understand , where does math & *10 come from!

[@Bjorn-vh2px]

// Math is used for generating random numbers And *10 used for multiplying those number. Once watch his two dimensional array video 👍

[@purnimanaskar2671]

// Online Java Compiler // Use this editor to write, compile and run your Java code online public class Demo { public static void main(String[] args) { int nums[][][]=new int [3][4][5]; // three dimensional for(int i=0;i

[@dashtech1387]

Not understand

[@RameshMaity90]

public class Array { public static void main(String[] args) { int num1[]=new int[3]; int num[][]=new int[3][4]; for(int i=0;i