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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 »
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!
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: Main.java.
Example explained. Every line of code that runs in Java must be inside a class. And the class name should always start with an uppercase first letter. In our example, we named the class Main. Note: Java is case-sensitive: "MyClass" and "myclass" has different meaning.
Java is an object-oriented programming language. Everything in Java is associated with classes and objects, along with its attributes and methods. For example: in real life, a car is an object. The car has attributes, such as weight and color, and methods, such as drive and brake.
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
OOP stands for Object-Oriented Programming. Procedural programming is about writing procedures or methods that perform operations on the data, while object-oriented programming is about creating objects that contain both data and methods.
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
myMethod() is the name of the method. static means that the method belongs to the Main class and not an object of the Main class. You will learn more about objects and how to access methods through objects later in this tutorial. void means that this method does not have a return value.
Java Arrays. Arrays are used to store multiple values in a single variable, instead of declaring separate variables for each value. To declare an array, define the variable type with square brackets: String[] cars; We have now declared a variable that holds an array of strings.
