Need help setting up a Finite State Machine in BlueJ

Hey all, I joined these forums to hopefully help me catch up with my Java skills. I haven't programmed in Java for almost a year, and the class I'm in now does little for review so I'm rusty to say the least. The assignment we were given recently is to create a Finite State Machine resembling a gumball machine. This are basically the requirements given:
The operation of the gumball machine is simple. It takes a quarter to get a gumball dispensed. The customer needs to deposit a quarter and turn the crank, and a gumball will be dispensed if the machine contains one or more gumballs.
Design steps:
There are a number of states: No_Quarter, Has_Quarter, Gumball_Sold, Out_of_Gumballs
Create an instance variable to hold the current state and define values for each of the states.
All the actions that can happen in the system are: insert_quarter, ejects_quarter, turns_crank, dispense_gumball, and refill_gumballs. The action dispense_gumball is an internal action the machine invokes when it reaches the Gumball_Sold state.
Create a class that acts as the state machine. For each action, create a method that uses conditional statements to determine what behavior is appropriate in each state.
Write a test program to test the GumballMachine class. You consider not just normal operations i.e. insert a quarter, turn the crank; but also operations such as insert a quarter, eject the quarter, turn the crank. Or what if you turn the crank twice after insert one quarter. Or what if you insert two quarters in a row.
Now trust me, I'm not asking for someone to come here with a hunk of code and say, ok use this, and it's done. What I'm here for is hopefully someone can walk me through the right thought process of how to implement the states, and where/how to include the actions to go along with the states. We're to use BlueJ to write the code, and I'm still pretty unfamiliar with its arrow system that tells Test Programs to use the linked class(es).
Thanks for any help in advance, and for what it's worth, speedy responses are especially appreciated!

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I have also used glabal variable and an event controller ( without that I was unable to get ffedback oo buuton click
So my question are
Is my problem due to the use of a shift register
Please tell me if you need other file to understand my problem
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Thibaut
Attachments:
Spectro State MAchine .vi ‏77 KB

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You should put the event structure into its own parallel while loop rather than sharing the loop with the state machine. Typically the terminals of the controls will be placed inside the event case where they are read. At least inside the loop.
Run your VI with execution highlighting on (the light bulb on the diagram toolbar). This will show you how dataflow works.
You probably do not need most of your global variables. Appropriate use of shift registers and wires would eliminate them.
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hello dear coders. I'm a software engineering student and i have an assignment to create an Elevator Simulator using various programming patterns.
One of them is the an advance form of the State Pattern from Gang of Fours, the Finite State Machine.
On assignment delivery i have to justify every choice i made in implementing the patterns. I have my understanding of the FSM ( finite state machine) but i don't know if it's even near the correct form.
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Since they are in portuguese i'll give you the translation:
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Porta Aberta = Door Open
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* @author bruno
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    private AbstractState globalState;
    private AbstractState previousState;
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        this.previousState = previousState;
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    public void setState(AbstractState state) {
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    public void setGlobalState(AbstractState globalState) {
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}class : AbstractState
* @author bruno
public abstract class AbstractState {
    protected AbstractState state;
    public abstract AbstractState execute();
    public abstract AbstractState up();
    public abstract AbstractState down();
    public abstract AbstractState open();
    public abstract AbstractState close();
    public AbstractState getState() {
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    public AbstractState(AbstractState state) {
        this.state = state;
    public AbstractState() {
        this.state = this;
    public void setState(AbstractState state) {
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}I omitted the concrete State Classes because of length, if you would like me to post them as-well please, don't hesitate to ask.
Sorry for the bad English and for the length of the post.
THANK YOU IN ADVANCE!

>
Two things with this code:
public void update() {
if (state instanceof StateDoorClosed) {
if (previousState instanceof StateGoingUp || previousState instanceof StateGoingDown) {
this.changeState(this.getState().open());
} else if (previousState instanceof StateDoorOpen || previousState instanceof StateDoorClosed) {
this.changeState(this.getState().execute());
} else if (state instanceof StateStopped && !(globalState instanceof StateStopped)) {
if (globalState instanceof StateGoingUp) {
this.changeState(this.getState().up());
} else {
this.changeState(this.getState().down());
} else {
this.changeState(this.getState().execute());
}Firstly, that doesn't look like a finite state machine. In a FSM the next state depends on the current state and the input it receives, whereas your machine it depends on the previous state and the global state, and no input.
Secondly, almost always if you're using instanceof to change behaviour, you're doing something wrong. It's useful for testing data you've received from a general purpose channel, such as some serialisation mechanisms or an implementation of string formatting, but it shouldn't be in the core of classes where you've designed both sides of the contract.
Usually you implement either a general purpose method to return the next state from a state given its input, or (as you have done) provide several methods to cope with the different inputs and return the next state. So the core execution logic would be for a general transition method.
get input from outside
state = state.transition(input)or for specific methods:
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Your AbstractState has a reference to another state - why ? It should either have one state for each transition out of it, or none (for example, if you make each state instance an nested class of the machine, or use an enum for the states, they don't need anything other than a transition() method, and no fields)

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