Is ATMState an abstract class?

[ntalbs]

ood-interview/atm/atm/states/ATMState.java

Lines 7 to 12 in 29b9ddc

	/**
	* ATMState is an abstract class that defines the state of the ATM.
	* This abstract class contains the default behavior for each state, which usually
	* renders a message to the display and does not perform any action.
	*/
	public class ATMState {

The explanation in the book is confusing because it mixes an interface and an abstract class, but the ATMState class itself is defined as a normal class.