package headfirst.state.gumball;public class GumballMachine { 	final static int SOLD_OUT = 0;	final static int NO_QUARTER = 1;	final static int HAS_QUARTER = 2;	final static int SOLD = 3; 	int state = SOLD_OUT;	int count = 0;  	public GumballMachine(int count) {		this.count = count;		if (count > 0) {			state = NO_QUARTER;		}	}  	public void insertQuarter() {		if (state == HAS_QUARTER) {			System.out.println("You can't insert another quarter");		} else if (state == NO_QUARTER) {			state = HAS_QUARTER;			System.out.println("You inserted a quarter");		} else if (state == SOLD_OUT) {			System.out.println("You can't insert a quarter, the machine is sold out");		} else if (state == SOLD) {        	System.out.println("Please wait, we're already giving you a gumball");		}	}	public void ejectQuarter() {		if (state == HAS_QUARTER) {			System.out.println("Quarter returned");			state = NO_QUARTER;		} else if (state == NO_QUARTER) {			System.out.println("You haven't inserted a quarter");		} else if (state == SOLD) {			System.out.println("Sorry, you already turned the crank");		} else if (state == SOLD_OUT) {        	System.out.println("You can't eject, you haven't inserted a quarter yet");		}	}   	public void turnCrank() {		if (state == SOLD) {			System.out.println("Turning twice doesn't get you another gumball!");		} else if (state == NO_QUARTER) {			System.out.println("You turned but there's no quarter");		} else if (state == SOLD_OUT) {			System.out.println("You turned, but there are no gumballs");		} else if (state == HAS_QUARTER) {			System.out.println("You turned...");			state = SOLD;			dispense();		}	} 	public void dispense() {		if (state == SOLD) {			System.out.println("A gumball comes rolling out the slot");			count = count - 1;			if (count == 0) {				System.out.println("Oops, out of gumballs!");				state = SOLD_OUT;			} else {				state = NO_QUARTER;			}		} else if (state == NO_QUARTER) {			System.out.println("You need to pay first");		} else if (state == SOLD_OUT) {			System.out.println("No gumball dispensed");		} else if (state == HAS_QUARTER) {			System.out.println("No gumball dispensed");		}	} 	public void refill(int numGumBalls) {		this.count = numGumBalls;		state = NO_QUARTER;	}	public String toString() {		StringBuffer result = new StringBuffer();		result.append("\nMighty Gumball, Inc.");		result.append("\nJava-enabled Standing Gumball Model #2004\n");		result.append("Inventory: " + count + " gumball");		if (count != 1) {			result.append("s");		}		result.append("\nMachine is ");		if (state == SOLD_OUT) {			result.append("sold out");		} else if (state == NO_QUARTER) {			result.append("waiting for quarter");		} else if (state == HAS_QUARTER) {			result.append("waiting for turn of crank");		} else if (state == SOLD) {			result.append("delivering a gumball");		}		result.append("\n");		return result.toString();	}}