ServiveOffice, Customer class

package ServicePkg;

public class Customer {
    // number of all Customers
    private static int totalCounter = 0;
    private int number;

    public Customer() {
        totalCounter += 1;
        this.number = totalCounter;
    }

    public static int getTotalCounter() {
        return Customer.totalCounter;
    }

    public int getNumber() {
        return this.number;
    }

    @Override
    public String toString() {

        return "Customer #" + this.number;
    }
}