Thread: How to declare an object of multi-dimension array?

<the code show below was copied from this forum>

import java.util.ArrayList;
 
public class ArrayList2d<Type>
{
    ArrayList<ArrayList<Type>>  array;
 
    public ArrayList2d()
    {
        array = new ArrayList<ArrayList<Type>>();
    }
 
    /**
     * ensures a minimum capacity of num rows. Note that this does not guarantee
     * that there are that many rows.
     *
     * @param num
     */
    public void ensureCapacity(int num)
    {
        array.ensureCapacity(num);
    }
 
    /**
     * Ensures that the given row has at least the given capacity. Note that
     * this method will also ensure that getNumRows() >= row
     *
     * @param row
     * @param num
     */
    public void ensureCapcity(int row, int num)
    {
        ensureCapacity(row);
        while (row < getNumRows())
        {
            array.add(new ArrayList<Type>());
        }
        array.get(row).ensureCapacity(num);
    }
 
    public void Add(Type data, int row)
    {
        ensureCapacity(row);
        array.get(row).add(data);
    }
 
    public Type get(int row, int col)
    {
        return array.get(row).get(col);
    }
 
    public void remove(int row, int col)
    {
        array.get(row).remove(col);
    }
 
    public boolean contains(Type data)
    {
        for (int i = 0; i < array.size(); i++)
        {
            if (array.get(i).contains(data))
            {
                return true;
            }
        }
        return false;
    }
 
    public int getNumRows()
    {
        return array.size();
    }
 
    public int getNumCols(int row)
    {
        return array.get(row).size();
    }
}

Can anyone tell me how to declare an object of the class above?
Kindly thanks for help from you all..>.<

It does that because when I changed the code last time, I only made sure it compiled, not ran Hopefully it works now.

I wrote that code as a "sample" of how to create multi-dimensional ArrayLists and various operations you might want to do with them. While you're welcome to use that code for whatever you want, I would recommend directly using an ArrayList of ArrayLists (the concept embodied inside that post).

YES!!It's works!!
But there is an error inside the Add function. It should be getNumRows() rather than getRow() if I'm not mistaken and the ensureCapacity() function will cause an error if it's invoke.
Thank You so much!