java - abstract class and arraylist -

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i don't understand lines on code 

public abstract class subject{

the class abstract subject super class

    public subject() {

and constructor?

like inside constructor passed on sub classes?

observers = new arraylist<ioserver> ();

here have no idea.

the constructor passed on subclass constrained. observers variable initialized within constructor, don't see declared.

like:

arraylist<ioserver> observers = new arraylist<ioserver> ();

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