Java Tutorial for Beginners

Welcome to the world of Java programming. This tutorial is the ideal starting point for your journey or a good opportunity to brush up on your skills, whether you're a novice or an experienced developer.

Java is a powerful programming language that is now essential to a wide range of sectors, including financial services, scientific research, mobile applications, and web development. Java has withstood the test of time and is still one of the most commonly used programming languages in the world, thanks to its robust features and syntax.

We will investigate the foundations of Java programming in this tutorial and learn about its syntax, data types, control structures, and object-oriented programming ideas. Therefore, buckle up and get ready to go on an exciting Java programming adventure! But first, let's go over some interesting and important details about the "Java programming language" before we begin.

Who created the Java programming language?

James Gosling, Patrick Naughton, Chris Warth, Ed Frank, and Mike Sheridan at Sun Microsystems created the Java programming language in the mid-1990s. The team initially worked on a project titled "Green Project" that aimed to develop a programming language for home electronics such as televisions and VCRs. However, as the project progressed, the team realized the need for a platform-independent, general-purpose programming language.

This led to the creation of Java, which was released officially in 1995. Since then, Java has become one of the world's most popular programming languages.

What is the official website of the Java programming language?

"https://www.java.com" is the official Java website. Oracle Corporation, the current owner of the Java programming language and platform, owns and maintains this website.

What are the filename extensions of the Java programming language?

Depending on the type of file, the Java programming language employs multiple file extensions. Here are some of the most frequent Java filename extensions:

What language influenced Java?

The following languages influenced the Java programming language:

• C++
• Pascal
• Objective-C
• Simula67
• Smalltalk

Languages influenced by Java

The following is a list of languages that the Java programming language has influenced:

• Scala
• Groovy
• Kotlin
• Clojure

What are the reasons to learn Java?

There are numerous reasons to learn Java programming, and it is impossible to list them all. But first, I'll go over some of the main reasons why we want to learn the Java programming language.

• Popularity
• Platform independence
• Object-oriented programming
• Job opportunities and high salaries
• Wide range of applications
• Community and support

What is Java used for?

You can learn and use your Java programming skills to develop a wide range of applications that fall under the following categories:

• Web development
• Mobile app development
• Enterprise software
• Gaming
• Scientific computing

Java can be used to create applications for embedded systems and smart devices that are part of the Internet of Things (IoT).

Famous applications using Java

Java is a flexible and frequently used programming language that has been around for more than 20 years. Its widespread use can be attributed to its multiplatform compatibility, object-oriented design, and wide range of libraries and frameworks. Millions of developers use Java today to build everything from straightforward desktop utilities to sophisticated enterprise systems.

The list of the most well-known and cutting-edge Java applications is provided below.

• Google
• Amazon.com
• LinkedIn
• Twitter
• Android OS
• Apache Spark
• Minecraft
• JIRA

Java basic program structure

There are numerous types of programs that can be written in Java, such as "programs with methods," "programs with conditional statements," "programs with classes and objects," "programs with file management," and so on, which you will learn about one at a time as you progress through this Java tutorial series.

For the time being, however, I'm going to include the general form, syntax, or program structure of a basic type of Java program, which is of course given below:

/*
 * This is a multi-line comment that describes the purpose of the program.
 */

// This is a single-line comment that explains the following line of code.
public class MyProgram {
    
    // This is the main method, which is the entry point for the program.
    public static void main(String[] args) {
        
        // This is a statement that prints a message to the output console.
        System.out.println("Hello, world!");
        
    }
    
}

Hello, world!

The content in between the "/*" and "*/" is referred to as multi-line comments, which will be ignored by the compiler and is used to define the program or the block of code. And the line starting with "//" is considered a single-line comment, used to describe code or a statement. Now, the following code:

public class MyProgram

is used to declare a public class named "MyProgram". Because this is the main class of the program, it must have the same name as the file (a Java source code file with a ".java" extension). Whereas the following code:

public static void main(String[] args)

declares the "main()" method. Please remember that each and every Java program must contain a "main" method because the execution of the program starts with the "main()" function. If I break down all the keywords used in the previous code, then:

• public: Access Modifier
• static: "static" is a reserved keyword, which means that a method is accessible and usable even though no objects of the class exist.
• void: This keyword declares nothing would be returned from method.
• main : This is the main place where the program starts running, or from here, our compiler starts checking and running our Java program or code.
• String[] args: It is the arguments passed to a program via the command line when it is executed. The "String[] args" parameter is an array of strings that contains the program's command-line arguments. Arguments on the command line are parameters passed to a program when it is executed from the command line. The arguments are passed to the program in the order they are entered, separated by spaces.

Finally, the following statement:

System.out.println("Hello, world!");

prints the text "Hello, world!" on the output console using the "System.out.println()" method. That is, the method "println()" of the "System.out" package. Use "print()" instead of "println()" to skip an automatic insertion of newline after outputting the data of the "print()" method.

Prerequisites

Before you start learning Java, you should have some basic computer knowledge. Also, if you know how to program in C or C++, you'll find it very easy to learn Java here; otherwise, don't worry, everything is explained step by step with examples where necessary.

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