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What is Java?

Java is a programming language widely used for coding web applications. Since it has been a popular language preferred by developers for over twenty years, there are millions of Java applications in use today. Java is a multi-platform, object-oriented, and network-centric language that can be used as a platform itself. It is a fast, secure, and reliable programming language that can be used to code all kinds of software, from mobile applications and enterprise software to big data applications and server-side technologies.

What is the Java programming language used for?

Since it is a free-to-use and versatile language, Java is used to create localized and distributed software. Common areas of use for Java include the following:

1. Game Development

Many popular video games, including mobile games and computer games, are created in Java. Even modern games that use advanced technologies such as machine learning or virtual reality are created with Java technology.

2.     Cloud Computing

Java is the ideal choice for decentralized cloud-based applications thanks to its structure that complies with the WORA [Write Once and Run Anywhere] philosophy. Cloud providers choose Java to run their programs on a wide range of platforms.

3.     Big Data

Java is used for data processing infrastructures that can work with complex data sets and large amounts of real-time data.

4.     Artificial Intelligence

Java offers a wide range of machine learning libraries. Being a stable and fast programming language, it is an ideal choice for developing AI applications such as natural language processing and deep learning.

5.    İnternet of Things

Java is used to program sensors and hardware in edge devices that can connect to the internet independently.

Why is Java so popular among modern software developers?

Java owes its popularity to its ease of use. Here are some reasons why developers continue to choose Java over other programming languages:

Higher-quality learning resources

Java has been around for a long time, so there are many learning resources for new programmers to turn to. Detailed documentation, comprehensive books, and courses support developers throughout the entire learning curve. Additionally, beginners can start by coding in Core Java before moving on to Advanced Java.

Integrated functions and libraries

Developers do not have to write every new function from scratch when using Java. They can take advantage of the rich ecosystem of integrated functions and libraries that Java offers to develop a wide variety of applications.

Active community support

Java has a large number of active users as well as a community that can support developers who encounter difficulties while coding. In addition, the Java platform software is maintained and updated regularly.

High-quality development tools

Java offers a variety of tools that support automated editing, debugging, testing, deployment, and change management processes. These tools make programming with Java both time- and cost-effective.

Platform Independent

Java code can run on any underlying platform, such as Windows, Linux, iOS, or Android, without the need for rewriting. This makes Java particularly powerful in today's environment where applications are required to run on multiple devices.

Security

Users can download untrusted Java code over the network and run it in a secure environment where it cannot cause harm. Untrusted code cannot infect the host system with a virus or read or create files on the hard disk. The security levels and restrictions in Java are also highly configurable.

How does Java work?

All programming languages ​​are tools used to communicate with machines. Machine hardware only responds to electronic communication. High-level programming languages ​​like Java act as a bridge between human language and hardware language. In order to use Java, a developer needs to understand two elements:

1. Java language and API’s

Provides front-end communication between the developer and the Java platform.

2. Java Virtual Machine

Provides back-end communication between the Java platform and the underlying hardware. Let's look at each of these in detail below.

What is Java API?

Java defines the syntax and semantics of the Java programming language. It contains the basic vocabulary and rules used to write algorithms, such as basic data types, if/else blocks, loops, etc.

APIs are important software components packaged with the Java Platform. They are pre-written Java programs that allow you to add and use existing functionality in your own code. You can use Java APIs to, for example, retrieve the date and time, perform mathematical operations, or You can use it to make changes.

All Java application code written by a developer combines new and existing code from Java APIs and Java libraries.

What is the Java Virtual Machine?

The Java Virtual Machine acts as an additional layer of abstraction between the Java platform and the underlying machine hardware. Java source code can only run on machines with the Java Virtual Machine (JVM). To understand why the Java Virtual Machine is needed, it is necessary to look at the history of programming.

History of Programming

When natural programming languages ​​first emerged, they fell into two broad categories based on how they communicated with the underlying hardware.

Compilers: The entire program is written with compilers in a syntax that resembles natural English, and the language then compiles (or translates) the entire code into machine code. The compiled code is then run on the hardware.

Interpreters: When interpreters are used, every high-level code statement is instantly interpreted into machine code. The written statements are processed by the hardware without looking at the next statement.

       Java Runtime Environment

Java program was the first language to combine the above two methods using a Java Virtual Machine (JVM). The Java code compiler is called Java Virtual Machine. All Java files are first compiled to bytecode. Java bytecode can only run on the JVM. The JVM then interprets the bytecode to run on the underlying hardware platform. So if the application is running on a Windows machine, the JVM interprets the application for Windows. However, if it is running on an open source platform like Linux, the JVM interprets the application for Linux.

How to program in Java

To start programming in Java, you must have a Java Edition installed on your system. There are four main Java Editions:

 1.    Java Standard Edition (Java SE)

2.    Java Enterprise Edition (Java EE)

3.    Java Micro Edition (Java ME)

4.    What is Java SE?

What is Java SE?

Java Standard Edition is the basic Java programming platform. It contains all the libraries and APIs that every programmer needs for Java development. Open Java Development Kit (OpenJDK) is free and open source distribution of Java SE.

Amazon Corretto is a free, multi-platform, production-ready distribution of OpenJDK. It can be used as an immediate replacement for many Java SE distributions and comes with free, long-term support from Amazon. It lets you run the same environment in the cloud, on-premises, and on your local machine.

What is the AWS SDK for Java?

The AWS SDK for Java simplifies the use of AWS services by providing a consistent and familiar set of libraries for Java developers. It supports higher levels of abstraction for simplified development. AWS-focused open source Java libraries are available, along with code samples and a Java API reference guide.

The SDK code samples include Java code samples and real-world use cases for AWS services to help speed up the development of your applications. Additionally, the Java API reference guide explains API operations for the latest version of the AWS SDK for Java.

Source: 

-Microsoft Official Site

-Amazon Web Service

-Codefinity

-Youtube