急！java的自动售货机找零程序

public static void main(String args[]){

Scanner sc = new Scanner(System.in)

System.out.print("The goods cost:")

int cost=sc.nextInt()

System.out.print("The customer paid:")

int paid=sc.nextInt()

change(cost,paid)

}

public static void change(int cost,int paid){

//unit of cost&paid is dollar

int change=(paid-cost)*100

int numOfTF=0//number of 25 cents

int numOfT=0//number of 10 cents

int numOfF=0//number of 5 cents

if(change<0)//payment is not enough

System.out.println("payment is not enough")

else{

numOfTF=(int)change/25

numOfT=(int)(change-numOfTF*25)/10

numOfF=(int)(change-numOfTF*25-numOfT*10)/5

System.out.println("Change is: "+numOfTF+" 25 cents, "+numOfT+" 10 cents, "+numOfF+" 5 cents.")

}

}

}

X1，X2，X3分别检测到1、5、10元；X4汽水按钮，X5咖啡按钮，X7找零按钮；

Y1汽水灯，Y2咖啡灯，Y3汽水阀，Y4咖啡按阀，Y5找零等，Y6找零阀；