Java- Constructor Chaining

This program implements constructor chaining. Comment below. Have fun!!!

//cannot use this and super in same constructor
class X
{
    public X(int i)
     {

     }
}
class Y extends X
{
    public Y(int i)
    {
        super(i);
    }
}
class Z extends Y
{
    public Z(int i)
    {
        super(10);
    }
}
class ChainDemo
{
    public static void main(String[] args)
    {
        Z ob = new Z(10);
    }
}
//finalise with object to force garbage collection