Refactoring Example 1

OrderService.java

import java.util.List;

public class OrderService {

    void print(List<Order> list, String n) {
        double outstanding = 0.0;

        System.out.println("*****************************");
        System.out.println("****** Customer Outstanding Total ******");
        System.out.println("*****************************");

        for (Order o : list) {
            outstanding += o.getAmount();
        }

        System.out.println("name: " + n);
        System.out.println("amount: " + outstanding);
    }
}

class Order {
    private double amount;

    public Order(double amount) {
        this.amount = amount;
    }

    public double getAmount() {
        return amount;
    }
}