How to return 2D array from a method in java?

[itiger]

I wrote sample code to test but it gives error. Following is the code that i wrote:

class ArrCreate
{
	public int[][] createArray()
	{
		int[][] s = new int[3][];
		s[0] = new int[4];
		s[1] = new int[2];
		for(int i = 0; i < s.length; i++)
		{
			for(int j=0; j < s[i].length; j++)
			{
				s[i][j] = j + 1;
			}
		}	
		return s;
	}
	public void displayArray()
	{
		int[][] a;
		a = createArray();
		for(int i = 0; i < a.length; i++)
		{
			for(int j=0; j < a[i].length; j++)
			{
				System.out.println(a[i][j]);
			}
			System.out.println();
		}
		
	}
}

class MultiArray
{
	public static void main(String args[])
	{
		ArrCreate Arr = new ArrCreate();
		Arr.displayArray();
	}
}

The program gives following error:
Exception in thread "main" java.lang.NullP ointerException
at ArrCreate.creat eArray(MultiArr ay.java:10…
at ArrCreate.displ ayArray(MultiAr ray.java:2…
at MultiArray.main (MultiArray.jav a:37)

[horace1]

you define s with 3 elements s[3] but only created s[0] and s[1]

        int[][] s = new int[3][];
        s[0] = new int[4];
        s[1] = new int[2];
        s[2] = new int[2];	// << missing??

[itiger]

Thank you, it is working now.