Arrays

[Vidya sumanasekara]

class A{
	public static void main(String args[]){
	int[] a = null , b [] = null;
	b = a;
	System.out.println( b );
	}

}

Output
arr.java:4: incompatible types
found : int[]
required: int[][]
b = a;
^
1 error


Can any one please help me to understand the output....

[Sunny Bhandari]

Hi Vidya,

I think you overlooked the following line in the code:

int[] a = null , b [] = null; 

I will split it into two lines to make it clear, the meaning will remain same:

int[] a = null;
int[] b [] = null;

You can refer the Array chapter in any good Java book or on the web.
Happy to help you....

[Mohamed Sanaulla]

In The line
int [] a = null, b [] = null, b is actually declared as int[][]. So you have 2D array 'b' being assigned to a 1D array 'a'.

[Hareendra Reddy]

Hello Vidya sumanasekara ,
The problem here is this line

  int[] a = null , b [] = null;

Now b is interpreted by compiler as 2-D array i.e b[][] ,
notice that a array if int type and b array of array of ints ..

HTH

[Vidya sumanasekara]

int[] a = null , b [] = null; This is same as 1-D a[] and 2-D b[][] is n't it..

Ok..thank you all of you

Hareendra Reddy wrote:Hello Vidya sumanasekara ,
The problem here is this line

  int[] a = null , b [] = null;

Now b is interpreted by compiler as 2-D array i.e b[][] ,
notice that a array if int type and b array of array of ints ..

HTH