Learn Java. Java is a popular programming language. Java is used to develop mobile apps, web apps, desktop apps, games and much more. Start learning Java now »

Aug 21, 2024 · Java Quickstart. In Java, every application begins with a class name, and that class must match the filename. Let's create our first Java file, called Main.java, which can be done in any text editor (like Notepad). The file should contain a "Hello World" message, which is written with the following code:

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What is Java? Java is a popular programming language, created in 1995. It is owned by Oracle, and more than 3 billion devices run Java. It is used for: Mobile applications (specially Android apps) Desktop applications; Web applications; Web servers and application servers; Games; Database connection; And much, much more!

The main() method is required and you will see it in every Java program: public static void main (String[] args) Any code inside the main() method will be executed.

With our online Java compiler, you can edit Java code, and view the result in your browser. Run » public class Main { public static void main(String[] args) { System.out.println("Hello World!");

The W3Schools online code editor allows you to edit code and view the result in your browser

Java Conditions and If Statements. You already know that Java supports the usual logical conditions from mathematics: Less than: a < b; Less than or equal to: a <= b; Greater than: a > b; Greater than or equal to: a >= b; Equal to a == b; Not Equal to: a != b; You can use these conditions to perform different actions for different decisions.

Java Packages & API. A package in Java is used to group related classes. Think of it as a folder in a file directory. We use packages to avoid name conflicts, and to write a better maintainable code. Packages are divided into two categories: Built-in Packages (packages from the Java API) User-defined Packages (create your own packages)

Java Comparison Operators. Comparison operators are used to compare two values (or variables). This is important in programming, because it helps us to find answers and make decisions. The return value of a comparison is either true or false.