Can an abstract class have a constructor?

Question

Can an abstract class have a constructor?

If so, how can it be used and for what purposes?

Answer 1

Consider this:

abstract class Product { 
    int value;
    public Product( int val ) {
        value= val;
    }
    abstract public int multiply();
}

class TimesTwo extends Product {
    public int mutiply() {
       return value * 2;
    }
}

The superclass is abstract and has a constructor.