Java: My 2D array runs out of bounds 1 number less than it should every single time

Question

I'm trying to add a string to a 2d array, maze. It compiles, but when I run it it gives "Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3" even though the dimensionY is set to 4.

public static void main(String[] args) throws IOException
{

    List<String> lines = Files.readAllLines(Paths.get("C:\\Users\\zarga\\OneDrive\\Documents\\HW\\CSIS139\\MazeSolver\\src\\maze.txt"));
    // now print out what the text file has in a for loop.

    for (String line : lines) 
    { 
        System.out.println(line); 
    }
    String line = lines.toString();
    System.out.println();
    System.out.println("Dimensions: " + Dimensions1(lines) + " by " + Dimensions2(lines));
    System.out.println("Start position y: " + getEndCoordinateY(line));
    System.out.println("Start position x: " + getEndCoordinateX(line));
    char[][] mazeArray = new char[Dimensions1(lines)][Dimensions2(lines)];
    mazeArray = mazeCreator(lines, mazeArray );
}

//get first number in dimension
public static int Dimensions1(List<String> list)
{
    String firstLine = "";
    String stringList = list.toString();
    for (int i = 1; i <= 3; i++)
    {
        firstLine = firstLine + stringList.charAt(i);
    }
    int firstDim = Integer.parseInt(firstLine);
    return firstDim;
}

//get second number in the dimension
public static int Dimensions2(List<String> list)
{
    String firstLine = "";
    String stringList = list.toString();
    for (int i = 5; i <= 7; i++)
    {
        firstLine = firstLine + stringList.charAt(i);
    }
    int secondDim = Integer.parseInt(firstLine);
    return secondDim;
}

//get ending coordinate Y position
public static int getEndCoordinateY (String list)
{
    String lastLine = "";
    String stringList = list;
    int startY = 0;
    int length = list.length();
    for(int i = length - 2; i > (length - 5); i--)
    {
        lastLine = stringList.charAt(i) + lastLine;
    }
    startY = Integer.parseInt(lastLine);
    return startY;
}

//get ending coordinate X position
public static int getEndCoordinateX (String list)
{
    String lastLine = "";
    String stringList = list;
    int startX = 0;
    int length = list.length();
    for(int i = length - 6; i > (stringList.length() - 9); i--)
    {
        lastLine = stringList.charAt(i) + lastLine;
    }
    startX = Integer.parseInt(lastLine);
    return startX;
}

//create the maze
public static char[][] mazeCreator (List<String> list, char maze[][])
{
    int dimensionX = Dimensions1(list);
    int dimensionY = Dimensions2(list);
    String lines = "";
    String stringList = list.toString();
    for(int i = 8; i <= stringList.length() - 18; i++)
    {
        if(stringList.charAt(i) == ',' || stringList.charAt(i) == ' ')
        {
            //do nothing to get rid of all ,'s or spaces
        }
        else
        {
            lines = lines + stringList.charAt(i);
        }
    }

    System.out.println(lines);
    int offset = 0;
    for(int x = 0; x < dimensionX; x++)
    {
        for(int y = 0; y < dimensionY; y++)
            {
                maze[x][y] = lines.charAt(offset++);
            }
    }
    System.out.println(maze);
    return maze;
}

}

I've printed Dimensions1(lines) and Dimensions2(lines) and both come out to 4. So the dimensions should be 4 by 4, but for some reason it runs out of bounds at 3.