Implementing Interface in Java 101

Java interfaces

Java is one of the best computer languages that we’ve got today. And having this on one’s  resume can make a real difference in the job market. 

In addition, you’ll have a lot of scope with this language for creativity. All that you might need, you’ll find right here. 

Java is also the main computer programming language that data scientists use for their statistical models in BigData. 

But the thing is that as you learn and master this, you’ll see that it’s not the easiest. And thus, it’s going to create certain challenges for you. 

To deal with that, the best thing you can do is to have a solid grasp of the basics. 

That’s going to make sure you can identify the issue before you go and try to fix it. We’re going to cover one of them here.

In this article, we’re going to discuss all you need to know about Java interfaces. Read carefully to have a clear understanding of this in detail.

Now, what is Java Interfaces? 

The first thing that I must point out is, what ‘Interfaces’ in Java is not. 

It’s not the same thing as Classes, as a lot of beginners who are learning this language get confused with this. The relation is in the fact that interfaces work with classes to achieve a certain outcome. 

Interface, as the name signifies, is going to be the connection between the class and all things external to it. And when you implement an interface from a particular class, it’s going to retain the behavior of that interface. 

On the same note, it’s going to be the point through which different software components interact. Different classes have different interfaces for each.

And that’s the gist of what this does. Including that, there are a lot of other implementations of this as well. Now let’s talk about its specifics in more detail.

Working with Java Interfaces 

Talking about computer languages is going to be pretty pointless if we don’t talk about the use cases. 

That’s why in this section, I’m going to be breaking down all of this with working examples. 

Declaring an Interface Upfront 

The first step here involves declaring the interface for implementation. This is going to happen within the source code that you’re going to put up after that. 

In order to declare an interface, you’re going to have to use the keyword. Once you do that, it’s going to provide you abstraction. 

You’re going to have that with an empty body, and the fields associated with it are going to be public. 

Also, they’re going to be final, as well as static by default. All methods are going to work for the class which is going to implement the interface.

Relation of Classes with Interfaces 

Let’s talk about it in a functional perspective, as to how exactly it works and with all the other components. 

An interface is going to be responsible for extending another interface, and a class for a class. But a class is the component that’s going to implement the interface. 

So you can clearly see that they’re not the same thing. However, this is going to be relevant during any code implementation. You’ll see that each of these is responsible for performing different tasks. 

Examples of Java Interfaces 

Nothing’s going to be complete without showing examples, and that’s what I’m going to give here in this section. 

1. The Bank Interface

The Bank interface is a rather common interface that we get to use quite often while coding with Java. 

With this, we’re mostly going to get numerical operations which will need their own specific protocols. 

Using this interface here is going to be the most proper thing which the compiler would work with. 

2. The Drawable Interface

With the Drawable interface, you’re going to be able to work with all figures and representations. 

This comes in really handy for manipulating the different shape representations on the screen. 

Also, it forms the base and works along with a lot of other components to provide all sorts of functional flexibility. 

End Note

So after going through this article, I hope now you got a clear understanding of these interfaces. And also a few of the use cases that are there, the common ones mainly. 

Now, using these isn’t going to be the simplest task to do, as there are lots of technicalities within it. But there’s nothing that you cannot do with proper practice. 

As far as its consideration in operational purposes, you’d have to use this with other components. This would need more practice as well. Therefore, I wish you good luck with your journey to Java. 

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