public class One
{ public static void main(String[] args)
	{
		Matrix myMatrix1 = Matrix.read("D:\\MyText.txt", 2, 2);
	        Vector myVector1 = Vector.read("D:\\MyText.txt", 4, 1); //ЗДЕСЬ ОШИБКА
}
}
		

class Matrix
{
	protected int[][] arr;
	
	public Matrix(int n, int m)
	{
		arr = new int[n][m];
	}

public static Matrix read(String path, int n, int m) 
	{
	
		Matrix myMatrix = new Matrix(n, m);
		try
			{
				Scanner sc = new Scanner(new File(path));
				for (int i = 0; i < n; i++)
					{
						for (int j = 0; j < m; j++)
						{
							myMatrix.arr[i][j] = sc.nextInt();
						}
					}
				sc.close();
				System.out.println("read()'s ending");
			}
		catch (Exception e)
			{
				System.out.println("Sorry, Exception");
				return myMatrix;
			}
		return myMatrix;
	}

class Vector extends Matrix {
	Vector (int n) 
	{
		super(n, 1);
	}
}

Matrix matrix = new Matrix(n, m);
matrix.read(filepath, n, m);

 Vector v = new Matrix(n, 5);