package statemachine;

interface State {
	void run();
}

abstract class StateMachine {
	
	protected State currentState;
	abstract protected boolean changeState();
	
	protected final void runAll() { 
		while(changeState()) 
			currentState.run();
	}
}

// A different subclass for each state:
class Wash implements State {
	public void run() { 
		System.out.println("Washing");
	}
}

class Spin implements State {
	public void run() {
		System.out.println("Spinning");
	}
}

class Rinse implements State {
	public void run() {
		System.out.println("Rinsing");
	}
}

class Washer extends StateMachine {
	
	private int i = 0;
	// The state table:
	private State states[] = {
			new Wash(), new Spin(), 
			new Rinse(), new Spin(),
	};
  
	public Washer() { runAll(); }
  
	public boolean changeState() {
		if(i < states.length) {
			// Change the state
			currentState = states[i++]; 
			return true;
		} else
      	return false;
	}
}

public class StateMachineDemo {
	
	Washer w = new Washer();
	
	public void test() {
		System.out.println("Constructor has done all the work!");
	}
	
	public static void main(String args[]) {
		new StateMachineDemo().test();
	}
}