Gain insights into Java programming by exploring conditional statements, loops, math, logic, inheritance, generics, and arraylists, to become an intermediate Java developer.

Learn Java for free with this interactive course, and get a handle on one of the most popular programming languages in the world.

You'll start with a simple hello world program and proceed to cover common concepts such as Conditional Statements, Loop Statements, Math, and Logic in Java, before moving on to more advanced concepts like Inheritance, Generics, and ArrayLists, along with much more.

By the time you're done, you'll be an intermediate level Java developer, ready to take on your own projects.

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class HelloWorld {
    public static void main(String args[]) {
        System.out.println("Hello World!");
    }
}

# Detailed explanation

Now let's look at the **Hello World!** sequentially. 

##  `class HelloWorld`
It is written as:

Java is an object-oriented programming language. Therefore, every line that needs to be executed should be inside a class. This line declares a class `HelloWorld`.


- **Declarations and definitions:** A class declaration provides the name and visibility of a class. In our example, `class HelloWorld` is the class declaration. It consists (in this case) of one keyword, `class` followed by the identifier `HelloWorld`.

- The **`class` declaration** is then followed by a block (surrounded by curly braces `{}`), which provides the class's definition.

This means that we are defining a class named `HelloWorld`. Other classes, or in our case, the command line, can refer to the class by this name. 


$$$$
##  `void main()`

The `main` is the point from where all the Java programs start its execution. In order to execute your program, you must follow the valid signature of `main()` method which is given below:

Let's explore how a simple "Hello World!" program works in Java.

Getting Started with Java!

Variables & User Input

Simple Maths & Logic

Strings and String Processing

Conditional Statements

Loops

Methods

Arrays

Classes and Inheritance

Generics

ArrayLists

Java Exam

Hello World: Code Explanation

The Hello World! program

Detailed explanation #

`class HelloWorld`