Sparse Matrix - need help. Array index of out bounds: 1

[xelub]

hi there. first time here. im getting an array index out of bounds on my code. keep checking and simulating it but there no error on my simulating. when i run it, it gives an error arrays out of bounds: 1
any help??
this is my code.

import java.util.Scanner;
public class Sparse {
	 int num = 0;
	 public void Count_Nonzero(int Arr1[][],int m, int n)
	{
		int Row = 0;
		while(Row<m)
		{
			int Col= 0;
			while(Col<n)
			{
				if (Arr1[Row][Col] != 0) 
				{
					num++;
				}
				Col++;
			}
			Row++;
		}
		
	}
	 
	
	public static void main(String[] args) {
		Sparse Keyboard = new Sparse();
		Scanner scan= new Scanner(System.in);
		System.out.println("Input rows");
		int m=scan.nextInt();
		System.out.println("Input Column");
		int n=scan.nextInt();
		 int arr1[][] = new int [m][n];
		for(int i=0; i<m;i++){
			for(int j=0;j<n;j++){
				System.out.println("Enter Element ["+i+"]["+j+"]");
				arr1[i][j]=scan.nextInt();
				
			}	
		}
		Keyboard.sparse(arr1,m,n);	
		
	}


	 public void sparse(int Arr1[][],int m, int n)
	{
		
		int ArrNew[][] = new int [num+1][3];
		ArrNew[0][0]= m;
		ArrNew[0][1]= n;
		ArrNew[0][2]= num;
		int Row = 0;
		int I=1;
		while (Row<m)
		{
			int Col=0;
			while(Col<n)
			{
				if(Arr1[Row][Col] != 0)
				{
				 ArrNew[I][0] = Row;
				 ArrNew[I][1] =Col;
				 ArrNew[I][2] = Arr1[Row][Col];
				I++;
				}
				Col++;
			}
			Row++;
		}
		for(int i=0; i<m;i++){
			for(int j=0;j<n;j++){
				System.out.print("|"+ArrNew[i][j]+"| ");
			}	
			System.out.println();
		}	
	}	

}

[Tolls]

Please use code tags when posting code.
What is the full exception you are getting, and from what line of code?

[xelub]

sorry. how can you use code tags? newbie here.
the line : Keyboard.sparse(arr1,m,n);
and line : ArrNew[I][0] = Row;
are the problems. getting exception.

[JosAH]

I fixed the tags for you. b.t.w. those Exceptions also mention the line number where the Exception was thrown.

kind regards,

Jos

[Mr.Java]

Make follwing change to remove runtime Error

int ArrNew[][] = new int [m*n][3];
instead
//int ArrNew[][] = new int [num+1][3];
Also make some change to output code block
for(int i=0; i<m;i++){
for(int j=0;j<n;j++){
System.out.print("|"+ArrNew[i][j]+"| ");
}
System.out.println();
}
coz ArrNew[][] now have more colum
and more rows.......

[JosAH]

Make follwing change to remove runtime Error

int ArrNew[][] = new int [m*n][3];

That way you get a 'sparse' array that takes more memory than a dense array; bad idea.

kind regards,

Jos