CashRegister.java

public class CashRegister {
	
	public static int registers = 0;
	public int transactions = 0;
	public double amount = 0.00;
	
	public CashRegister() {
		registers = registers + 1;
	}
	
	public double AddTransaction(double a) {
		amount = amount + a;
		return amount;
	}
	
	public static int RegisterCount() {
		return registers;
	}

}

UseCashRegister.java

import CashRegister;

public class UseCashRegister {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		CashRegister register = new CashRegister();
		
		System.out.println("Number of Registers:" + register.RegisterCount());
	}

}