Introduction to Java: Everything you need to know about Java programming


Keywords: Programming in Java, JVM, Compiler, JDK, Java

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Programming in Java is an excellent start if you want to learn to code. Java is platform-independent, object-oriented, simple and straightforward. Additionally, Java is one of the world’s most popular programming languages. This article guides you as a beginner to what programming in Java means.

Have you come across the word Java? Or are you perhaps curious about how to learn to program? Maybe you are wondering what to build in Java and how to get started? Perfect! This is the first article in our series on programming in Java. We will go through the basic for everything you need to know about programming in Java to get started.

This introductory chapter includes the following articles:

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What is programming?

Programming, also referred to as coding, is a way of explaining to your computer what you want it to do. We can imagine programming as instructions to the computer that specify precisely what it should perform. This basically means that you provide the computer a set of instructions that are written in a language that the computer can understand.

Furthermore, these instructions are written in different programming languages where each language has its advantages and disadvantages and therefore, best suits different uses. For example, one programming language may be best suited when programming websites, while another language is better suited when programming an app for mobile. In other words, the programming languages have advantages and disadvantages depending on what you are going to program.

What is Java programming?

Java is a programming language created in the mid-’90s. Java is a powerful general-purpose programming language used to develop anything from desktop and mobile applications, big data processing, to large robots. Programming in Java has gained its popularity due to it being platform-independent, object-oriented and easy to use. Additionally, according to the well-known PYPL indexes from Github and TIOBE index, Java is today one of the most popular programming languages and one of the most common languages you start with when learning to program. In summary, Java is:

  • One of the world’s most popular programming languages.
  • Platform-independent, object-oriented and easy to use.
  • Can be used to program everything from mobile apps to large robots.

Why learn Java?

In fact, there are hundreds of different programming languages; for example, Wikipedia lists over 700 different programming languages. So why choose Java as your programming language? All programming languages have advantages and disadvantages, and the answer to which programming language to use is, it depends on what you are going to program.

There are over 700 different programming languages

Wikipedia

But now, let’s focus on why you should learn and use Java

One of the most popular programming languages  

Java is one of the most popular programming languages available and one of the most popular to start with. In several popular indexes measuring the popularity of programming languages, Java is constantly ranked in the top. Whether it’s usages in Github or Google searches, Java is every year in the top 3.

Java Programming Code

Additionally, according to Go Java, there are over 12 millions software developers programming in Java, while Oracle estimates that there are more than 9 million Java developers worldwide, in other words, a very popular programming language.

Over 12 million software developers programming in Java

Go Java

You can build almost anything in Java

Java is on the computer’s desktop; it’s in the phone’s applications, it’s in the debit card, and so on. Java is almost everywhere, and it also makes the possibilities for what you can create almost endless. For example, Java is one of the languages used when programming apps for Android

Large community to support you

There is an extensive library of prepared tools you can use, and whatever you are programming, you will always encounter some hurdles. It facilitates having a large community of programmers worldwide where we all can help each other and answer questions.

Java is platform independent

Java is platform-independent, which means that you can run Java on all operating systems such as Mac, Windows or Linux. When you run a java program, you compile the program into a so-called byte code. Moreover, the byte code can then be used in a virtual machine, which in Java’s case is called JVM (Java Virtual Machine). We will learn more about how this works in the article Compiler and JDK – This is what you need to start programming in Java.

Java is an object-oriented programming language

Object-oriented programming means that you create objects that interact with each other. A common problem in programming is that programs quickly become large, complex and complicated. By building the program into small “modules” (what we in programming call objects), these modules can interact with each other and combine to large programs. Since each object is isolated, it is easy to create small components where each part handles its part of the program. Therefore, you gain great control and overview of the program.

Summary: Why programming in Java

  • Object-oriented language, which means that several models can interact with each other.
  • It is a simple and straightforward programming language.
  • Java is platform-independent, that means you can run Java on all operating systems such as Mac, Windows or Linux.
  • Java is easy to understand and simple to get started with.
  • One of the most common programming language used when programming apps for Android.

With that being said, let your creativity flow and don’t be afraid to explore your new ideas. One of the best ways to learn how to program is to try building some of your projects that have in the back of your mind.

How to program in Java?

To program in Java, it is recommended that you use a development environment, a so-called IDE (Integrated development environment) that makes it easy to write code. For example, we are using IntelliJ. Additionally, you also need a so-called JDK (Java Development Kit) to run programs in Java. In the article Compiler and JDK – This you need to start programming in Java, we will explain how to get started with programming in detail every step of the way.

What can you program with Java?

You can program almost anything in Java. For example, mobile applications, games, servers, robots or machines. Therefore, your imagination sets the limits. Remember, the best ways to learn how to program is to try building some of your projects that have in the back of your mind.

Idea Coding Programming Java

Can anyone learn Java?

Of-course! Various programming languages are varied challenging to learn, and it takes more than one afternoon to learn to master a programming language. Be patient! However, you can learn to program the most basic programs in just a few minutes. You need absolutely no advanced training to start programming; programming is best learned by trial and error.

Operating system do I need to program in Java?

Java is platform-independent, which means that you can run Java on all operating systems such as Mac, Windows or Linux.

How do you work with programming?

As the digitalization of society increases, more and more companies need knowledge in programming. Today, for example, it is prevalent for companies to sell a product, have an app or a website, all of which require knowledge in programming. There are many different types of programming jobs, such as software developers, backend and frontend developers, database developers or system developers where every kind of service requires its specialist knowledge in the particular subject. Because the programming profession is so broad, it is most common to specialize in a precise area.

How do you learn programming?

Easier programming is taught already in primary school in several countries. There are also numerous higher education programs where you learn programming in-depth to have programming as part of your future profession.

Additionally, now there are also numerous resources online that you can use to learn to program. Code-Knowledge is one of these! Here at Code-Knowledge.com, we will go through everything you need to know to get started and learn to program. By following our articles in our chapters, you will soon understand what it means to program. But perhaps most importantly, it’s very fun and creative to learn to code!

Is programming in Java free?

All you need is a computer, and an internet connection, then just get started. Everything regarding Java development is available for free online, and it’s easy to get started. For example, Code-Knowledge is entirely free, and everything is available for you to read.

Is Java a good language to start programming in?

Java is one of the most common programming languages that you start with when learning to program. Especially at many of the technical universities, Java is taught as the first language. On the other hand, in primary school, you usually start with a more high-level language, such as Python. Moreover, according to Go Java, over 5 million students learn Java in school.

Over 5 million students learn Java in school

Go Java

FAQ: Programming in Java

Questions below are some frequently asked questions we usually get on our sites about programming in Java.

To get started with programming in Java, you need a compiler, IDE, JDK and JVM. We go through in detail about how to download and get started with Java in Compiler and JDK – This is what you need to start programming in Java.

Frågor och svar
Can I use my Mac when programming in Java or do I have to buy a new computer? I will start studying this fall and take some programming courses, and worry that my laptop will not work.

You can program on the computer that’s most beneficial to you. Operating systems such as OSX, Windows or Linux all work great for programming. Therefore, programming on you Mac works fine.

I’ve heard that Python is easier to learn. Should I start with Python instead of programming in Java?

Python is a more, what could be described as “high-level language”, than Java, which means that it is at a higher “abstraction level”. Which means that it can be perceived as more comfortable to get started with Python because there is less to think about when you start coding. However, in Java, you will learn more in-depth about how programming works. In Java, you have more control to specify precisely how you want the program to operate, so you will maybe become a better programmer in the long run.

What do I need to be able to program in Java?

To get started with programming in Java, you need a Compiler, IDE, JDK and JVM. We will go through every step from downloading Java to get started with programming in Java in the article: Compiler and JDK – This is what you need to start programming in Java.

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