how to make a dynamic 2d array code example

Example 1: Create dynamic 2d array in java

// Create dynamic 2d array in java
import java.util.ArrayList;
import java.util.List;
public class Dynamic2dArray 
{
   public static void main(String[] args) 
   {
      List<int[]> li = new ArrayList<>();
      li.add(new int[]{2,4,6});
      li.add(new int[]{3,5});
      li.add(new int[]{1});
      // element at row 0, column 0
      System.out.println("Element at [0][0]: " + li.get(0)[1]);
      // get element at row : 1, column : 1
      System.out.println("Element at [1][1]: " + li.get(1)[1]);
   }
}

Example 2: how to make a n*n 2d dynamic array in c++

int** a = new int*[rowCount];
for(int i = 0; i < rowCount; ++i)
    a[i] = new int[colCount];