create dynamic 2d array in java

1// Create dynamic 2d array in java
2import java.util.ArrayList;
3import java.util.List;
4public class Dynamic2dArray 
5{
6   public static void main(String[] args) 
7   {
8      List<int[]> li = new ArrayList<>();
9      li.add(new int[]{2,4,6});
10      li.add(new int[]{3,5});
11      li.add(new int[]{1});
12      // element at row 0, column 0
13      System.out.println("Element at [0][0]: " + li.get(0)[1]);
14      // get element at row : 1, column : 1
15      System.out.println("Element at [1][1]: " + li.get(1)[1]);
16   }
17}

1int** arr = new int*[10]; // Number of Students
2int i=0, j;
3for (i; i<10; i++) 
4	arr[i] = new int[5]; // Number of Courses
5/*In line[1], you're creating an array which can store the addresses
6  of 10 arrays. In line[4], you're allocating memories for the 
7  array addresses you've stored in the array 'arr'. So it comes out 
8  to be a 10 x 5 array. */