Learn the basic concepts of Java such as loops, methods, and arrays.

Android Development with Java

This module will be our guide on getting started with Java. We'll start with a simple “Hello World” program and proceed to cover common concepts such as conditional statements, loops, math, and logic in Java. Then, we’ll move to more advanced concepts like inheritance, generics, and array lists, along with much more.
By the time we're done, we'll have enough knowledge to write simple Java programs.

Learn Java from Scratch

## Hello World: Example
The first program that most aspiring programmers write is the classic **"Hello World"** program. The *purpose* of this program is to display the text **"Hello World!"** to the user. 

The **"Hello World"** example is somewhat famous as it is often the first program presented when introducing a programming language.

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

>  **Did you know?** The `System.out.println()` displays text in the current line of the console and then move the cursor to the beginning of the next line. 

$$$$

## `Java` as a structural language

Before discussing the particulars, it is useful to think of a computer program in terms of both its **structure** and its **meaning** simultaneously.

A `Java` program is structured in a specific and particular manner. `Java` is a language and therefore has grammar similar to a spoken language like $English$. The grammar of computer languages is usually much, much simpler than spoken languages but comes with the disadvantage of having stricter rules. Applying this structure or grammar to the language is what allows the computer to understand the program and what it is supposed to do.

The overall program has a **structure**, but it is also important to understand the purpose of part of that **structure**. By analogy, a textbook can be split into sections, chapters, paragraphs, sentences, and words (the structure), but it is also necessary to understand the overall meaning of the words, the sentences, and chapters to fully understand the content of the textbook. You can think of this as the semantics of the program.

A line-by-line analysis of the program should give a better idea of both the **structure** and meaning of the classic **"Hello World"** program.

# Hello World: Example
The first program that most aspiring programmers write is the classic **"Hello World"** program. The *purpose* of this program is to display the text **"Hello World!"** to the user. 

The **"Hello World"** example is somewhat famous as it is often the first program presented when introducing a programming language.

>  **Did you know?** The `System.out.println()` displays text in the current line of the console and then move the cursor to the beginning of the next line. 

$$$$

# `Java` as a structural language

Before discussing the particulars, it is useful to think of a computer program in terms of both its **structure** and its **meaning** simultaneously.

A `Java` program is structured in a specific and particular manner. `Java` is a language and therefore has grammar similar to a spoken language like $English$. The grammar of computer languages is usually much, much simpler than spoken languages but comes with the disadvantage of having stricter rules. Applying this structure or grammar to the language is what allows the computer to understand the program and what it is supposed to do.

The overall program has a **structure**, but it is also important to understand the purpose of part of that **structure**. By analogy, a textbook can be split into sections, chapters, paragraphs, sentences, and words (the structure), but it is also necessary to understand the overall meaning of the words, the sentences, and chapters to fully understand the content of the textbook. You can think of this as the semantics of the program.

A line-by-line analysis of the program should give a better idea of both the **structure** and meaning of the classic **"Hello World"** program.

In this lesson, you will get acquainted with the Hello World program and a basic introduction to Java.

Getting Started with Java!

Variables & User Input

Simple Maths & Logic

Strings and String Processing

Conditional Statements

Loops

Methods

Arrays

ArrayLists

Java Exam

Conclusion

Hello World!

Hello World: Example #

`Java` as a structural language