CareerCup

Take A simple shape example

class Shape {
virtual  void draw();
}
class rect:public shape{
void draw();
}

// Now if I want to add/register another class as circle then I can do like
class circle:public shape{
void draw();
}

I hope, I answered your question. If anyone has better answer please answer it.

class A extends Fact{
}
class B extends Fact{
}

etc.....
class Factory{
public static Fact getInstance(String ID/className){
if(ID==A.className()){
return new A();
}else-if(ID==B.className()){
return new B();
}
....
..

}

class A extends Fact{
}
class B extends Fact{
}

etc.....
class Factory{
public static Fact getInstance(String ID/className){
if(ID==A.className()){
return new A();
}else-if(ID==B.className()){
return new B();
}
....
..

}