Java is one of the most widely used programming languages ​​and platforms today. It is common because of its efficiency and simple syntax. It is known for its speed and reliability, and is used in web applications, desktops, game consoles, and even the most sophisticated scientific supercomputers. And of course Java is the language of the Android mobile operating system and is widely used to encode Android applications.

However, if you want to use the language and format in all its glory, you need to have a strong understanding of the basics of Java that we publish here!

What is Java?

Before you continue, spend a minute breaking down the Java language.

Basically, Java is a general-purpose, object-oriented, classroom, and programming language. It is compiled into a byte code representation that is executed by a virtual machine. This makes the language multilevel and Java programs can be used on many different devices and operating systems. Java is an excellent choice for new application developers because it is fast, secure and reliable in the long run.

It is mainly used to develop smart applications for laptops, mobile phones, game consoles and data centers. Java has been in use since 1995, since its creation by James Gosling, and has grown into one of the most popular and valuable languages ​​in the world.

Using Java in a nutshell

Java is used for many purposes due to its versatility. Some common uses of language and platform include:

  • Android applications
  • enterprise software
  • scientific calculation
  • big data analytics
  • web servers and server side technology

The Java Platform is a collection of programs that allow developers to create and use Java programming applications efficiently. It has a compiler, an execution engine, and a set of libraries (Java API).

Java platform and its components

While practicing the basics of Java, it is essential to understand how the Java programming language works.

First you write the Java program – the source code. This is a human-readable language that is easy for a person to understand, but which is not performed directly by the CPU.

The source code is then compiled using the Java Development Kit (JDK) byte as a byte code representation. This is a version of the Java version that can be easily understood by a computer, even if it is difficult for a person to read it.

Finally, that byte code is executed by the Java Virtual Machine (JVM). This is essentially a simulated computer running on your computer hardware and is responsible for executing Java bytecode. Using a just-in-time compiler (JIT), this byte code is converted on the fly to machine code used by a computer or device.

Java technologies

Java Standard APIs

Java provides comprehensive and well-designed APIs that cover everything from data types and common algorithms to specialized APIs such as XML parser and 3D rendering. Java APIs help you write your programs by providing many commonly needed functions, so you don’t have to.

Java Development Pack (JDK)

The Java Development Kit / JDK is a software development environment used to create Java applications and applets. It can be used on Solaris and Linux as well as macOS and Windows. One of its important functions is to compile Java applications into bytecode.

The funny fact is that you can download multiple versions of the JDK to the same computer. The JDK is equipped with the tools needed to write Java programs and run them later through the JRE. It includes a compiler, an applet viewer, and also a launcher for Java applications to help the compiler convert the code into Java bytecode.

Java Virtual Machine (JVM)

A Java virtual machine is an engine that provides a runtime environment for running Java applications and code. It converts the previously obtained byte code into machine language on the fly.

The JVM is an integrated part of the Java Runtime Environment. The JVM provides a platform-independent way to execute Java source code.

Versions of the JVM are available on many platforms. Once you have compiled the program, it can theoretically run on any JVM using the same source code for multiple platforms.

Java Runtime Environment (JRE)

The Java Runtime Environment is used to run Java applications. There are class libraries, a JVM, and a loader class. To run a Java program, you need a JRE.

The JRE does not have Java development tools such as a compiler or debugger. This is what JDK is for!

OOP and vocabulary

Java is an object-oriented programming language used to solve complex problems by dividing them into smaller sub-problems.

Here is a quick glossary for Java as an object language:

Class: a plan or model / prototype that defines the methods and data members of any object. It is determined by the keyword in the category. Objects are instances of each class.

Object: a clearly identifiable whole of the real world is known as an object. A chair, square, or the like can be considered an object. It has a unique behavior, space, and identity. Data fields with current values ​​represent the state of the object.

Abstraction: a method for hiding irrelevant information from the user concerned. If a competitor can only drive a car, he does not necessarily need to know the mechanics of the vehicle. Java abstract the keyword is used in this situation.

Encapsulation: encapsulation binds data and functions into a single unit. The class can act as a second class capsule – also called a “wrapper”. An example is the Java bean: it is a fully encapsulated class for reference.

Heritage: it is the mechanism used to acquire the properties of a class. It is used to expand keywords and increase code reusability.

Polymorphism: the ability to occur in many forms – a kind of deformation. One operation can be performed in many ways depending on the target objects

Why learn Java?

  • Java is a must for individuals who want to code for a specific niche. For example, it is very important for creating Android applications.
  • The OOP programming model is safe and is based on authentic public key encryption techniques. It is resistant a forum that eliminates error situations by focusing on time errors and runtime errors.
  • Write once, run anywhere The system based on the JRE and the JDK alone is exceptional. It creates multi-threaded programs that guarantee high performance at every stage of software development, no matter what device they use.
  • Java has become increasingly popular over time and is thus a high-paying skill.

Final thoughts

Finally, it is safe to say that Java is a dynamic language and platform that is ready to grow further. From beginners to masters of artisans, Java is the ultimate solution to many of the life cycle challenges of software development products.

A little homework and a lot of dedication is all you need to master the language of the Java multiverse! You can learn much more about Java programming and coding Android mobile applications. Envato Tuts + is a great place to start!

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