#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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