Beautiful oops ebook code#

While from a business perspective the app was a success, the technical part caused you many headaches.

Beautiful oops ebook code#

The code of the navigator became bloated. And even later, another option for building routes through all of a city’s tourist attractions. Later you planned to add route building for cyclists. Right after that, you added another option to let people use public transport in their routes. So with the next update, you added an option to build walking routes. But apparently, not everybody likes to drive on their vacation. People who traveled by car were bursting with joy.

The first version of the app could only build the routes over roads. A user should be able to enter an address and see the fastest route to that destination displayed on the map. One of the most requested features for the app was automatic route planning. The app was centered around a beautiful map which helped users quickly orient themselves in any city. The other method accepts two parameters, a CoffeeSelection and an int.One day you decided to create a navigation app for casual travelers. The first one accepts one parameter of type CoffeeSelection. The BasicCoffeeMachine class implements two methods with the name brewCoffee. Let’s use the same CoffeeMachine project as we used in the previous posts of this series.

This approach is popular and it is known as static binding or static polymorphism. That signature allows the compiler to identify which method to call and binds it to the method call. In most cases, these overloaded methods provide a different but very similar functionality.ĭue to the different sets of parameters, each method has a different signature. This kind of overloading is not advisable because it makes the API difficult to understand For example, one method accepts a String and a Long, and another one accepts a Long and a String.

They need to expect the parameters in a different order.

The types of parameters need to be different, with one method accepting a String and another one accepting a Long.

They need to have a different number of parameters, one method accepting 2 and another one accepting 3 parameters.

The parameter sets have to differ in at least one of the following three criteria: But, Java uses a different set of parameters called method overloading and represents a static form of polymorphism. Like many other OOP languages, Java allows you to implement multiple methods within the same class that use the same name. Due to this, all objects in Java are polymorphic because they pass at least two instanceof checks. As described in our post about inheritance, all Java classes extend the class Object. If the object successfully passes multiple is-a or instanceof tests, it’s polymorphic. You can perform a simple test to know whether an object is polymorphic. Each type can provide its own independent implementation of this interface. In computer science, polymorphism describes the concept that you can access objects of different types through the same interface. Polymorphism is one of the core concepts of object-oriented programming (OOP) that describes situations in which something occurs in several different forms. Object-Oriented Programming has different concepts allowing developers to build logical code.