Two dimensional array

[Garlapati Ravi]

class Test1 {
	public static void main (String [] args) {
		int[][] scores = new int[3][3];
		scores[0] = new int[1];
		scores[0][1] = new Integer(1);
	}
}

I am trying to understand this snippet, please correct me if i am wrong.
int[][] scores = new int[3][3];
123
456
789
scores[0] = new int[1]; // does this line converts above [3][3] to below structure, will 2 and 3 cells disappears after this line ?
1
456
789

because i am getting java.lang.ArrayIndexOutOfBoundsException: 1 at scores[0][1] = new Integer(1);

please clarify. Thanks!

[Ankit Garg]

Yes, what you did made scores a jagged array i.e. different dimensions will have different sizes...

[Seetharaman Venkatasamy]

there is no such thing as a two dimensional array in Java . instead use Array of Arrays

[S Ali]

Its because you assigned scores[0] to an int array with length 1. keep in mind that scores[0] is only a reference to another array that's how java is different from other languages.

[karthick chinnathambi]

As our friend Ankit said, there is no multidimensional array in java.....

The multi-dimensionality can be achieved through Array of Arrays.............

 int[][] scores = new int[3][3];   

Here you have created

1)3 array objects each of which in turn can hold 3 integer array objects
2)You have initialized those 3 integer array objects also using new operator

To be clear,

scores[0]--->holds an int[] array object
scores[1]--->holds an int[] array object
scores[2]--->holds an int[] array object

each int[] object is also initialized with each element(integer) in it initialized to zero...

There is nothing wrong if you initialize like,

  int[][] score=new int[3][]  

and then assign int[] to each of the score array objects(array of array).....

Hope you will understand very clearly................

[karthick chinnathambi]

Ankit Garg wrote:Yes, what you did made scores a jagged array i.e. different dimensions will have different sizes...

friend he hasn't created a jagged array in his third line i suppose....

but he has re-assigned the first score array element with a different int[] object......and hence after this statement it becomes a jagged array.....

[Ankit Garg]

friend he hasn't created a jagged array in his third line i suppose....
but he has re-assigned the first score array element with a different int[] object......and hence after this statement it becomes a jagged array.....

What I meant was the same, maybe my language was not clear.

As our friend Ankit said, there is no multidimensional array in java.

seetharaman said that, so credit goes to him not me

[Garlapati Ravi]

Thank you all Guys, all your replies were helpful! i have to stick this point in my mind "Array of Arrays"