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  1. public class Main {
  2.     public static void main(String[] args) {
  3.         Order o = new Order(new Order.OrderParams("O-1", "C-1", 100.0));
  4.         o.applyPercentageDiscount(10);
  5.         Order.Printer.printDetails(o);
  6.  
  7.         Customer c = new Customer(new Customer.CustomerParams(
  8.             "C-1", "Ana", "ana@example.com", "21 99999-0000"
  9.         ));
  10.         Customer.Printer.printDetails(c);
  11.     }
  12. }
  13.  
  14.  
  15. class Order {
  16.     private String orderId;
  17.     private String customerId;
  18.     private double amount;
  19.  
  20.     // Introduce Parameter Object + Encapsulate Field
  21.     public Order(OrderParams params) {
  22.         setOrderId(params.getOrderId());
  23.         setCustomerId(params.getCustomerId());
  24.         setAmount(params.getAmount());
  25.     }
  26.  
  27.     // compat: construtor antigo delega
  28.     public Order(String orderId, String customerId, double amount) {
  29.         this(new OrderParams(orderId, customerId, amount));
  30.     }
  31.  
  32.     // Encapsulate Field
  33.     public String getOrderId() { return orderId; }
  34.     public void setOrderId(String orderId) {
  35.         if (orderId == null || orderId.trim().isEmpty())
  36.             throw new IllegalArgumentException("orderId inválido");
  37.         this.orderId = orderId;
  38.     }
  39.  
  40.     public String getCustomerId() { return customerId; }
  41.     public void setCustomerId(String customerId) {
  42.         if (customerId == null || customerId.trim().isEmpty())
  43.             throw new IllegalArgumentException("customerId inválido");
  44.         this.customerId = customerId;
  45.     }
  46.  
  47.     public double getAmount() { return amount; }
  48.     public void setAmount(double amount) {
  49.         if (amount < 0) throw new IllegalArgumentException("amount não pode ser negativo");
  50.         this.amount = amount;
  51.     }
  52.  
  53.     // Rename Method: applyDiscount -> applyPercentageDiscount
  54.     public void applyPercentageDiscount(double discountPercentage) {
  55.         validateDiscountRange(discountPercentage);                 // Extract Method
  56.         setAmount(calculateDiscountedAmount(discountPercentage));  // Extract Method
  57.     }
  58.  
  59.     // Extract Method
  60.     private void validateDiscountRange(double discountPercentage) {
  61.         if (discountPercentage <= 0 || discountPercentage > 100) {
  62.             throw new IllegalArgumentException("Desconto deve estar entre (0, 100].");
  63.         }
  64.     }
  65.  
  66.     // Extract Method
  67.     private double calculateDiscountedAmount(double discountPercentage) {
  68.         return getAmount() * (1 - discountPercentage / 100.0);
  69.     }
  70.  
  71.     // Move Method: impressão em classe interna dedicada
  72.     public static final class Printer {
  73.         private Printer() {}
  74.         public static void printDetails(Order order) {
  75.             System.out.println("Order ID: " + order.getOrderId());
  76.             System.out.println("Customer ID: " + order.getCustomerId());
  77.             System.out.printf("Amount: $%.2f%n", order.getAmount());
  78.         }
  79.     }
  80.  
  81.     // Introduce Parameter Object (classe interna)
  82.     public static final class OrderParams {
  83.         private final String orderId;
  84.         private final String customerId;
  85.         private final double amount;
  86.  
  87.         public OrderParams(String orderId, String customerId, double amount) {
  88.             if (orderId == null || orderId.trim().isEmpty())
  89.                 throw new IllegalArgumentException("orderId inválido");
  90.             if (customerId == null || customerId.trim().isEmpty())
  91.                 throw new IllegalArgumentException("customerId inválido");
  92.             if (amount < 0) throw new IllegalArgumentException("amount não pode ser negativo");
  93.             this.orderId = orderId;
  94.             this.customerId = customerId;
  95.             this.amount = amount;
  96.         }
  97.  
  98.         public String getOrderId() { return orderId; }
  99.         public String getCustomerId() { return customerId; }
  100.         public double getAmount() { return amount; }
  101.     }
  102. }
  103.  
  104.  
  105. class Customer {
  106.     private String customerId;
  107.     private String name;
  108.     private String email;
  109.     private String phoneNumber;
  110.  
  111.     // Introduce Parameter Object + Encapsulate Field
  112.     public Customer(CustomerParams params) {
  113.         setCustomerId(params.getCustomerId());
  114.         setName(params.getName());
  115.         setEmail(params.getEmail());
  116.         setPhoneNumber(params.getPhoneNumber());
  117.     }
  118.  
  119.     // compat: construtor antigo delega
  120.     public Customer(String customerId, String name, String email, String phoneNumber) {
  121.         this(new CustomerParams(customerId, name, email, phoneNumber));
  122.     }
  123.  
  124.     // Encapsulate Field
  125.     public String getCustomerId() { return customerId; }
  126.     public void setCustomerId(String customerId) {
  127.         if (customerId == null || customerId.trim().isEmpty())
  128.             throw new IllegalArgumentException("customerId inválido");
  129.         this.customerId = customerId;
  130.     }
  131.  
  132.     public String getName() { return name; }
  133.     public void setName(String name) {
  134.         if (name == null || name.trim().isEmpty())
  135.             throw new IllegalArgumentException("name inválido");
  136.         this.name = name;
  137.     }
  138.  
  139.     public String getEmail() { return email; }
  140.     public void setEmail(String email) {
  141.         if (email == null || email.trim().isEmpty())
  142.             throw new IllegalArgumentException("email inválido");
  143.         this.email = email;
  144.     }
  145.  
  146.     public String getPhoneNumber() { return phoneNumber; }
  147.     public void setPhoneNumber(String phoneNumber) {
  148.         if (phoneNumber == null || phoneNumber.trim().isEmpty())
  149.             throw new IllegalArgumentException("phone inválido");
  150.         this.phoneNumber = phoneNumber;
  151.     }
  152.  
  153.     // Move Method: impressão em classe interna dedicada
  154.     public static final class Printer {
  155.         private Printer() {}
  156.         public static void printDetails(Customer customer) {
  157.             System.out.println("Customer ID: " + customer.getCustomerId());
  158.             System.out.println("Name: " + customer.getName());
  159.             System.out.println("Email: " + customer.getEmail());
  160.             System.out.println("Phone Number: " + customer.getPhoneNumber());
  161.         }
  162.     }
  163.  
  164.     // Introduce Parameter Object (classe interna)
  165.     public static final class CustomerParams {
  166.         private final String customerId;
  167.         private final String name;
  168.         private final String email;
  169.         private final String phoneNumber;
  170.  
  171.         public CustomerParams(String customerId, String name, String email, String phoneNumber) {
  172.             if (customerId == null || customerId.trim().isEmpty())
  173.                 throw new IllegalArgumentException("customerId inválido");
  174.             if (name == null || name.trim().isEmpty())
  175.                 throw new IllegalArgumentException("name inválido");
  176.             if (email == null || email.trim().isEmpty())
  177.                 throw new IllegalArgumentException("email inválido");
  178.             if (phoneNumber == null || phoneNumber.trim().isEmpty())
  179.                 throw new IllegalArgumentException("phone inválido");
  180.             this.customerId = customerId;
  181.             this.name = name;
  182.             this.email = email;
  183.             this.phoneNumber = phoneNumber;
  184.         }
  185.  
  186.         public String getCustomerId() { return customerId; }
  187.         public String getName() { return name; }
  188.         public String getEmail() { return email; }
  189.         public String getPhoneNumber() { return phoneNumber; }
  190.     }
  191. }
  192.  
  193.  
Success #stdin #stdout 0.16s 56172KB
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Standard input is empty
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Order ID: O-1
Customer ID: C-1
Amount: $90.00
Customer ID: C-1
Name: Ana
Email: ana@example.com
Phone Number: 21 99999-0000
https://ideone.com/jENurz
language:
Java (HotSpot 12)
created:
5 days ago
visibility:
public

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