Learning Java from scratch in 2026: a practical guide

Java is one of the most job-rich languages in Italy: banks, insurance, public administration, e-commerce and software houses have run on it for decades. It is more structured and "verbose" than Python, but on large team projects that structure becomes an advantage in order and reliability. If you aim for an enterprise developer job, Java is a solid bet.

The examples below are commented step by step; on the platform they run on the server engine (Java is a compiled language, it does not run in the browser like Python or JavaScript).

The structure of a Java program

Unlike Python, in Java every program lives inside a class and starts from a special method called main:

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

It looks like a lot just to print a line, but that "frame" (class, main) is the scaffolding you later build large programs on. System.out.println prints a line to the screen.

Variables and types

In Java every variable has a declared type: you say upfront whether it is a whole number, a decimal, or text. This prevents many mistakes.

int age = 25;
double price = 9.99;
String name = "Julia";

System.out.println(name + " is " + age + " years old");

int = whole number, double = decimal number, String = text. Types are Java's hallmark: more effort at the start, fewer bugs later.

Decisions: if / else

int temperature = 31;

if (temperature > 28) {
    System.out.println("It's hot: drink water!");
} else {
    System.out.println("Nice weather");
}

The condition goes in round brackets, the block in braces. The concept is identical to every other language; only the form changes.

Repetition: the for loop

for (int i = 1; i <= 5; i++) {
    System.out.println("Line " + i);
}

Three parts inside the parentheses: where you start (int i = 1), how long you continue (i <= 5), how you advance (i++).

Methods: reusable blocks

A method is Java's equivalent of a function: write it once, call it whenever you like.

public class Main {
    static String greet(String name) {
        return "Hi, " + name + "!";
    }

    public static void main(String[] args) {
        System.out.println(greet("Sara"));
        System.out.println(greet("Mark"));
    }
}

A study plan toward employment

1. Month 1 — basic syntax: types, conditions, loops, methods, arrays.
2. Month 2 — object-oriented programming (classes, objects, inheritance, interfaces): it is the heart of Java and why companies use it.
3. Month 3 — collections (List, Map), error handling, file reading/writing.
4. Then — a backend framework (Spring Boot) and a project of your own on GitHub: that is what gets you hired.

Where to go from here

The Java path follows exactly this progression, from zero to object-oriented programming and beyond, with exercises you write and run on the platform's server engine. The first chapters are free. To see professional routes, take a look at paths and careers.