Question

Possible Duplicate:
What is the use of creating a constructor for an abstract class in Java?

Example:

abstract public class AbstractDemo 
{
    private int ab;
    public AbstractDemo() 
    {
        ab=10;
    }

    public int getAb()
    {
        return ab;
    }

    public void abstractMethod()
    {
        //On the line below it gives error.
        AbstractDemo demo=new AbstractDemo();
    }

}

Edited to format code

Answer 1

In my opinion, the constructor in abstract class can do some init work which all the subclass do not need to repeat in its own construtor.