Introduction to Java

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{
    "first_name": "test",
    "last_name": "test",
}

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SELECT * FROM Customers ;

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{
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Computers and programming!

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123 Today, computers are everywhere: smartphones in our pockets, notebooks and PC in offices and at home, servers in large data centers, control systems of cars and planes. Computers are composed of different hardware and are managed by different operating systems such as Windows, Linux, Mac OS, Android, and others. We will use the term “platform” to refer to the combination of hardware and software that makes up a computer.

To make computers solve our problems, programmers create computer programs which represent sequences of instructions for performing a specific task. To create these programs, programmers write instructions in various programming languages. These languages are more restrictive than a natural language, but they allow us to explain what we actually want from computers without any ambiguity.

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Some programming languages are specialized for web / mobile / system programming while other languages are used for solving challenges in various domains.

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print("It's code")  # It's a comment!

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Among the key requirements for modern programming languages:

• possibility of rapid software development;

• good performance of developed programs;

• the possibility of creating complex software systems;

• and so on.

One of the most popular programming languages and $\prod\nolimits_{i=1}^ni=n!$ one that highly satisfies these requirements is Java. We will give an overview of this language.

What is Java?

Java is a general-purpose, modern programming language initially developed by Sun Microsystems, and currently owned by Oracle Corporation. The key feature of the language is platform independence; this means that the same Java program can be run on multiple platforms without any changes! This principle is also known as "write once, run anywhere" (WORA).

Note, a platform is a combination of computer hardware and software.

Java has been one of the most popular programming languages for many years. It has earned the top position in the TIOBE index. The language has a huge community of developers around the world! If you have a problem, you can always ask other developers or find a suitable answer online.

Java is used in our Android smartphones, the financial services industry, telecommunications, embedded systems, medical applications used to store patient data, computer games such as Minecraft, development tools like IntelliJ IDEA and Eclipse, and in many other areas.

A short history of Java

The Java language project was initiated in 1991 by James Gosling and his colleagues. In the beginning, the language was called "Oak." Later the project was renamed "Java," a reference to Java coffee. For this reason, the language’s logo is a cup of coffee.

The logo of the Java language

Sun Microsystems released Java 1.0 in 1995. After that, new versions were released every 1 to 3 years. Since Java 9, released in 2017, new versions have been released every 6 months. You can read more about the history and the most recent version here.

Some important features of Java

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Another important feature is the simple and clear syntax. Many elements of the language are easily readable and widely used in other programming languages like C/C++, C#, JavaScript, and Go.

It is also important that Java supports multiple programming paradigms that you will learn in this course. Java is primarily an imperative language based on the object-oriented concept; almost every part of a program is an object . Therefore, a program itself can be considered a set of interacting objects. But it also supports (at least partially) modern programming paradigms such as generic programming, concurrent programming, functional programming (starting with Java 8), and some others.

In conclusion, Java is a modern and popular programming language that can be successfully used in almost all domains.

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