App Development With Java: The Beginner’s Guide

March 22, 2022

app development with java

Web-based applications are an essential component of the digital world. An application or program is created to perform a specific action that end-users may quickly accomplish. Several applications are available, such as a word processor or media-playing software.

Have you ever been curious about what goes on behind the scenes when an application is created? Java is a well-known and efficient programming language that can aid in making an application. Do you want to create your app? Are you curious about how Java can help you do that?

Well, you’ve come to the right place! This beginner’s guide explores how app development with Java for an Android app, for example, is a great way to get started in app development. You’ll learn about the basics of Java programming and how to use it for app development.

An introduction to Java programming language

Java has long been one of the most popular programming languages used in Android app development, and it has helped developers create a wide range of applications, tools, and games. Java is a computer coding language developed by Sun Microsystems in the 1990s and subsequently acquired by Oracle.

Java interfaces

Java is a multi-purpose coding language with many influences, including C++ and C. Java and similar languages, such as Python and Rust, are built on the same set of concepts. The way the Java program is structured means object-oriented programming. These can be modular elements such as “classes,” which provide a coherent experience.

Java has many features (simple, portable, platform-independent, secure, and so on) that set it apart from other scripting languages.

Java is a simple language to learn because it is “platform-independent.” Java has many features (simple, portable, platform-independent, secure, and so on) that set it apart from other scripting languages. Various organisations widely use Java, including Amazon, Netflix, Instagram, LinkedIn, and Twitter.

9 Java tips for your app development project

You can ask any outsourcing company, and they will know how to use Java. Due to its user-friendliness and flexibility, software experts and web app developers commonly use this programming language. Java can be used for various programming tasks since all major operating systems support it.

It will be possible to run Java as long as a Java interpreter is available on the system. This language may be helpful to know since it has a wealth of security features, portability, and other benefits. The following are the top 9 tips to get you started with the fundamentals of Java for mobile app development.

1. Master the basics

It’s pretty essential to have a solid foundation and grasp the fundamentals of Java if you want to be a successful developer in this language. Understanding the fundamentals helps learn more advanced skills and develop and establish new ones in the future. Although the Java language isn’t particularly complex to learn, going in as a beginner and seeing all the code can be daunting.

2. Practice, practice, practice

Everyone can improve from practice, regardless of skill level or technical knowledge. You must practice programming and understand the fundamentals if you wish to be a successful Java developer. Programming helps you improve your problem-solving capabilities and prepare you for the real world by practicing. You may learn Java programming language from the comfort of your own home.

3. Learn Java 8‍

Java 8 was designed to address some of the problems with Java 7 and prior versions. Because the language has been in existence since the 1990s, it required some modifications. Overall, Java 8 has improved the language in several ways. It’s more reliable, efficient, and a better competitor against others than it was before.

Virtual device

Java 8 advantages include the following:

  • Easier to use
  • Security
  • Productivity
  • Better performance
  • Polyglot programming

Java 13 is now available. Though learning Java 13 is not yet required, you should code up to Java 8. Because the Java 8 version introduces Stream API and lambdas, you must be fluent in this stage.

4. Limit string size

Optimise rows to prevent memory loss. This will ultimately allow your project to operate more quickly and efficiently. Strings may get long and take up unnecessary space, which might be used for more useful features.

5. Periodically check code‍

It’s critical to the success of any project. Checking for bugs and correcting errors can be time-consuming and laborious. The good news is that other developers have recognised how tedious it is to review code, so they’ve developed tools to help with the process. However, you may catch bugs quickly by utilising Stack Trace or Null Pointer Exception.

6. Use microservices and cloud

With microservices rapidly becoming the de facto architecture for cloud-based apps, understanding the microservice architecture is more important than ever.

Android platform

Fortunately, the Spring Framework (Spring Boot and Spring Cloud) may help to simplify the development process.

7. Understand the Spring Framework

It’s also worth noting that Spring Framework, sometimes known as Spring Boot, is a Java framework for developing web apps. Compared to other microservices, most developers use Sprint Boot to create web applications. Understanding how Spring Framework works may give you an advantage over your competition and will only become more significant in the future.

8. Learn Java libraries and APIs

To become a successful Java developer in application development, you need to understand the entire Java ecosystem. It’s not essential to be an expert on every little aspect of Java, but understanding the APIs and libraries can assist you in grasping the Java ecosystem. Though there are many more, having a basic understanding of these APIs and libraries will get you started:

  • Unit testing libraries, such as JUnit and Mockito
  • JSON processing APIs, such as Gson and Jackson
  • XML processing APIs, such as Xerces and JAXB

9. Stay up to date

The language isn’t going anywhere. You should use online resources to stay updated on AI and ML tech‘s latest trends and prepare for action.

Android framework

Keeping up with the latest upgrades and developments might help you develop a great app. Keeping up with the newest research and implementing it is especially crucial for an inexperienced Java developer. Furthermore, being a part of the community and interacting with other app developers on forums can aid in developing your applications.

Application development with Java

To be an effective Android developer, it’s necessary to be well-versed in some areas. If you’re new to the Android apps development with Java, start by learning those fundamentals one at a time. You’ll be overwhelmed if you try to master everything all at once. The following is a suggested road map, which you may use to get the most out of your time.

Core Java

The following are the foundations you must master before getting into Android application development. Concentrate on learning object-oriented programming concepts to break down your program into components and develop reusable code. Java is the most popular scripting language, with many applications designed to run on all platforms. You may break it down into six parts and focus on learning one after the other:

  • Java Collections
  • Java Syntax
  • Java Multithreading
  • Exception Handling
  • OOP
  • Input/Output Streams

Testing Libraries

Libraries save you time. They allow you to utilize commonly used functionalities without coding them from the ground up. With the help of libraries like JUnit and PowerMock Mockito, you may write short bits of Java code to test your Android applications.

Developing apps

These are particularly useful for Test-Driven Development (TDD) since creating tests before writing your application’s code causes development to speed up. You’ll be using Java testing tools for the rest of your career, so get used to them early.

Android SDK (Software Development Kit)

It’s a one-stop shop for Android application development. It’s the only thing that remains constant throughout your Android application development career, given that you’ll almost certainly use many programming languages and IDEs.

You’ll need a method to execute your Java code on Android devices and take advantage of the real potential of the Android operating system after you’ve finished it.

The SDK is a software development kit (SDK) that consists of everything you’ll need to develop your product, including documentation, libraries, code samples, and procedures. The SDK also includes emulators for Android, allowing you to test your code on an actual Android device.


Even as you’re an entry-level Java developer for Android, you’ll need to master database management to write basic Java programs. A database is a structured data collection that enables applications to save data in tables and retrieve it as needed, depending on conditions.

Simple app

The final Java application development jigsaw component is Structured Query Language (SQL). There are many versions of SQL, but the most frequently used on Android devices is SQLite. Take it seriously since this will lay the groundwork for your Java programming career.

Training and practice

It’s now time for you to put everything you’ve learned into action and build confidence. It’s all right if you don’t feel comfortable enough to write code yet — the only way to enhance your coding skills is by practicing.

Boilerplate code

Pick up little jobs and create programs to address them. Don’t allow mistakes to stop you; even the most experienced developers make mistakes. Make a point of learning from your mistakes, correcting them, and moving on to other challenges.

Getting started with creating Android applications

As previously stated, Android developers need various tools to develop, deploy, create user test, simulate, and improve their applications. The following are some concepts to get you started:

Step 1: Download Android Studio

To create applications, you’ll need a development environment. Google recommends using Android Studio as an official IDE (Integrated Development Environment), making it a good choice.

code block

It comes with a complete package of development tools, such as APK Analyzer, Visual Layout Editor, Fast Emulator, Intelligent Code Editor, Real-time profiler, etc. Download Android Studio and your Android app development toolbox is complete.

Step 2: Configure Android Studio

The installation process for Android Studio is straightforward. To begin, you may stick to the default settings — customisations can be added later. It is crucial to note that Android Studio requires Java Development Kit.

working app

OpenJDK is significant to anyone who is just getting started. Install it from Oracle’s website if you do not already have JDK on your laptop. Follow simple installation instructions if necessary.

Step 3: Launch new Android project

A project is a collection of everything you’ll need to get your Android app off the ground, up, and operating. A project consists of your workspace, source code, assets, test code, and other related settings.

all the components

An Android Studio project is where all the action is. After completing your development process, all project materials are compiled into an APK (Android Package Kit). Select your project name carefully since it will become the name that appears in Google Play.

Step 4: Creating your Android app

You’ve completed all of the preliminary work to create your first Android app using Java, and you’re ready to put everything together. It’s time to put your mind and skills to good use.

user defined types

Your project’s directory structure will appear on the Android Studio workspace and an Android phone displaying the words “Hello World” on its virtual screen. Allow your programming skills to take your project from concept to reality.

Top Java resources for Android development

It’s time to choose where you’ll learn it after figuring out what you need to know.


The Java curriculum at CodeGym aims to make learning more fun and efficient by providing a practice-oriented Java course. The site is based on the idea that anybody can become a programmer if adequately guided.

About 80% of its Java course involves hands-on activities, so what you learn in theory is put to the test immediately.

About 80% of its Java course involves hands-on activities, so what you learn in theory is put to the test immediately. There are more than 1200 activities in a sequence of increasing difficulty to ensure that you continue to learn and keep track of your development via a virtual mentor.


Javarevisited is a one-stop shop for everything you need to know about Java programming. It provides exercises, articles, practice questions, and projects to aid you in your journey of understanding Java’s enormous realm.

Java logo

Beyond covering the intricacies of Java comprehensively, the website goes through unique thoughts that may benefit you as a Java developer throughout your career. It also directs you to additional helpful online resources so that you may continue to learn.


Codecademy is a popular website for learners seeking to learn code. It has more than 50 lectures and quizzes to help you learn and test your Java and other computer programming languages. The website allows you to design your learning plan and check your understanding by resolving issues, so you’ll never be out of practice. You may even have one of the community experts evaluate your code.


It adds a new layer to your Java programming learning experience. It’s not a typical tutoring website. It is, however, for when you want to leave the routine training behind and try something new.

Codewars logo

CodeWars offers a library of Java (and other programming languages) challenges to keep you occupied. You may communicate with a network of professional developers that will go through your code in detail and provide extensive feedback so you can learn more quickly.


If you’re not a big reader and like things to be represented, this is your resource. GeeksforGeeks is a comprehensive guide to all topics of computer science. It contains a wealth of Java content, and it thoroughly covers libraries, collections, lists, queues, OOP, maps, and other topics.

Java Fundamentals

Many inexperienced developers concentrate too much on syntax and libraries. They try to memorise Java instead of focusing on the concepts that it is based on. Pluralsight teaches you to write Java code while keeping an eye on the big picture using design patterns.

Take this course after you’ve finished the Java fundamentals and you are ready to start writing code. You would understand how to write Java programs and arrange your objects according to their function.

How long does it take to master Java programming?

There are many different ways to learn a programming language, and the amount of time it takes to learn Java language is determined by the strategies you use, how long you retain what you’ve learned, and how many hours you put in every week.

constraint layout

After studying a semester-long course at your local university or a 15-week curriculum at a coding Bootcamp, you can’t expect to know everything there is to know about Java programming. However, depending on your motivation and diligence, the fundamental skills you need to lay a solid foundation may be learned quickly.

Conclusion: How app development with Java improves inexperienced Java developer

You’ve now got a clear road map to learning Java and creating Android apps. Begin today and start writing code as soon as possible — that is the most effective approach to improve your programming skills.

conditional statements

Don’t be afraid to make mistakes or seek assistance because today’s professional coder was once a beginner who refused to give up.

About the author: Joe Silk -

Joseph is a Start-up Consultant, Copywriter & Business Owner with 9 years of PQE. He is extremely client-centric, able to work on a wide range of topics and deliver high-quality standards on projects of all sizes for clients all over the world. View on Linkedin