default methods vs abstract class


I was reading below link

I have not understood below point relating to state

Abstract class
Interface with default methods
State of objects
Abstract class can hold state of object
Interface with default methods can not hold state of objects


what is state of object?
How it one can hold and other cannot hold?

Also what it mean by overriding method to solve compilation error as below
you can solve this compilation error by overriding decorateWithPaints method in Room class
view plainprint?
public class Room implements Decorable,Paintable{  
    public void decorateWithPaints()  
        System.out.println("Decorate using paints");    


please advise
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CPColinSenior Java ArchitectCommented:
For your first question: Abstract classes can have member variables. Interfaces can't.

For your second question: If you implement more than one interface that has a default method with the same signature, you have to provide your own implementation of that method. If you don't provide one, the compiler can't tell which default method you wanted and gives you that error.

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