Need help its Urgent need to complete in time,plz help anyone.................

[shaggyoo7]

This is my code and it throws a NullPointerException in middle of execution
--------------------------------------------------------------------------
import java.io.*;
class Matrix
{
static int mat[][], colSize, rowSize;
public static void main(String args[])
{
try{
System.out.println("Enter the size of the Matrix");
BufferedReader a = new BufferedReader(new InputStreamReader(System.in));
colSize = Integer.parseInt(a.readLine());
BufferedReader b = new BufferedReader(new InputStreamReader(System.in));
rowSize = Integer.parseInt(b.readLine());
System.out.println("Enter values in the matrix.");
for(int i = 0 ; i < colSize ; i++)
{
for(int j = 0 ; j < rowSize ; j++)
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
mat[i][j] = Integer.parseInt(br.readLine());
}
}
int ans = mat[0][0];
for(int i = 0 ; i < colSize ; i++)
{
for(int j = 0 ; j < rowSize ; j++)
{
if(mat[i][j] > ans)
ans = mat[i][j];
}
}
System.out.println("The largest no is :"+ans);
}catch(Exception e){System.out.println("The Exception is "+e);}

}
}
--------------------------------------------------------------------------
After running the code i get the following output
--------------------------------------------------------------------------
C:\Program Files\Java\jdk1.5.0\bin>java Matrix
Enter the size of the Matrix
3
3
Enter values in the matrix.
The Exception is java.lang.NullPointerException
--------------------------------------------------------------------------

[masijade]

Because you declare the array but don't define it. You still need a line in there that starts with

mat =

I'll let you attempt to finish that line.

[shaggyoo7]

Thanks !!! so stupid of me got it.........