Sub-Classifications Are The Highest Level Of Code Description And Specificity The 3 Main Principles of Object Oriented Programming – How to Program With Java

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The 3 Main Principles of Object Oriented Programming – How to Program With Java

Object-oriented programming (or OOP) is actually classified according to three main principles.

1) Encapsulation

2) Inheritance

3) Polymorphism

These may sound like scary terms, but they’re actually fairly easy principles to grasp. To figure out how to program at your best, you need to understand these principles. So let’s look at the first main concept of OOP, encapsulation. Nesting just means that we want to restrict some other piece of code from accessing that object. So to illustrate, if you have a Person object and that Person object has a first and last name as attributes. In case another piece of code tries to change the first name of the Person object to “Frank3”, you can make a note of what you want to set the last name to and remove all the digits so that it’s just “Frank”. Without nesting, we won’t be able to prevent it from “silly programmers” change the values ​​of our variables to something that doesn’t seem reasonable, or worse, break the application.Does it seem reasonable?

The second concept of OOP, and a fundamental principle if you want to learn how to program in Java, is inheritance. This specific concept refers to a superclass (or parent class) and a subclass (or child class) and the simple fact that the child class inherits all the attributes of its parent. You can imagine this in a real world setting as a real parent and child. A child is likely to inherit certain characteristics from its parents, such as eye color or hair color. Let us imagine another example from a programming perspective, let’s say we have a superclass called “Vehicle” and subclasses like “Car” and “Motorcycle”. “Vehicle” has tires, so by inheritance both “Car” and “Motorcycle” do, however “Cars” have doors, “Motorcycles” don’t. So it would not be accurate to say that the “Vehicle” has doors, as that statement would be inaccurate. So you can see how we could define all the similar aspects of “car” and “motorcycle” and thus identify them within the “Vehicle” superclass.

The 3rd concept of OOP is polymorphism. This particular concept seems like one of the scariest, but I can explain it simply. Polymorphism means that an object (i.e. Animal) can take multiple forms while the program is running. Let’s imagine that you have designed an Animal class and defined the “Speak” method. He then asked his three buddies to evolve animals and use the “Talk” method. You won’t know what animals your friends create or how their animals talk unless you hear those animals. This is very similar to how Java handles this problem. This is called dynamic method binding, which simply means that Java will not understand how Animal talks until runtime. So maybe your friends created a dog, cat and snake. Here are the three types of animals and each of them speaks separately. When Java asks the dog to speak, it says “ouch”. Whenever Java asks the cat to speak, it says “meow”. When Java asks the snake to speak, it hisses. That’s the beauty of polymorphism, all we’ve done is define an animal interface using the Speak method and we can create a bunch of animal species that speak in their own special way.

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