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

Java Syntax

We created a Java file called Main.java, and we used the following code to print "Hello World" to the screen:

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

Java Data Types

Data types are divided into two groups:

• Primitive data types - includes byte, short, int, long, float, double, boolean and char
• Non-primitive data types - such as String, Arrays and Classes (you will learn more about these in a later chapter)

Primitive data types

A primitive data type specifies the size and type of variable values, and it has no additional methods.There are eight primitive data types in Java:

Non-primitive data types

Non-primitive data types are called reference types because they refer to objects.