Different ways to create an Object in java?
  1) using new 
      Netflix netflix = new Netflix();
  2) using class.forName()
      Netflix netflix =Class.forName("com.bellinfo.Netflix").newInstance();
  3) by clone()
      Netflix netflix1 = new Netflix();
      Netflix netflix2 = (Netflix) netflix1.clone();
  4) by desearlization (the object which is already Seralized)
      ObjectInputStream ooi = new ObjectInputStream(anInputStream);
      Netflix netflix = (Netflix) ooi.readObject();

Can we create an instance for a private constructor class out-side of the same class? 
  Yes, 
 

 class Netflix {
     private Netflix(){}
  }
  public static void main(String args[]){
       try {
           Class c = Class.forName("com.bellinfo.corejava.Netflix");
           Constructor con[] = c.getDeclaredConstructors();
           con[0].setAccessible(true);
           con[0].newInstance();
       } catch (ClassNotFoundException e) {
           e.printStackTrace();
       } catch (InvocationTargetException e) {
           e.printStackTrace();
       } catch (InstantiationException e) {
           e.printStackTrace();
       } catch (IllegalAccessException e) {
           e.printStackTrace();
       }
  }

Difference between instance vs object ?

   A blueprint for a house design is like a class description. All the houses built from that blueprint are objects of that class. A given house is an instance.  An 'instance' is a variable in memory that only has a memory address of an object in it.   

Difference between association vs aggregation vs composition ?

is a vs has a relationship in java ?