Can you list the main features of the Java language?

The main functional features of the Java language include:

• Object-oriented programming (OOP): support for classes, objects, inheritance, polymorphism, and encapsulation.
• Platform independence: Java bytecode runs on the JVM, allowing programs to run on different platforms without changes.
• Automatic memory management: the garbage collector frees unused objects.
• Multithreading: built-in support for threads and synchronization.
• Standard library: a comprehensive set of classes for working with collections, input-output, networking, databases, graphics, and more.
• Exceptions: error handling mechanism through try-catch-finally.
• Security: built-in security mechanisms and access control.
• Support for lambda expressions and functional programming: starting from Java 8.
• Generics: parameterized types for enhanced type safety.

Example of a simple Java class:

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