Service Obsession

gistfile1.java

public class Product {

  private String name;
  private float price;

  public Product(String name, float price){
    this.name = name;
    this.price = price;
  }
  // ... getters and setters 
}

public class ProductService{
  public void updatePriceWithDiscount(Product product, float rate){
    float newPrice = product.getPrice() - product.getPrice() / rate;
    product.setPrice(newPrice);
  }
  //... other USELESS methods
}

public class ProductController{
  //...
  //Maps some url or stuff like that
  public void updatePriceWithDiscount(Product product, float rate){
    productService.updatePriceWithDiscount(product, rate);
    //do some other thing with the response..
  }
}