Java

Java is a widely used, object-oriented programming language that is not tied to a single operating system. It is used to build web systems, enterprise software, server applications, and programs for different platforms. Its relatively clear syntax and large ecosystem make it useful for both beginners and professional developers.

Java is a high-level, object-oriented language. First released in 1995, it is known for the idea of “write once, run anywhere.” Java programs can run on different operating systems through the Java Virtual Machine (JVM).

Java has a large set of libraries and tools, and it is used in large software projects.

Java is used in many areas:

• Backend and server programming
• Enterprise management systems
• Web applications and APIs
• Android applications
• Desktop programs
• Banking and finance systems
• Cloud services
• Large-scale data systems

Java has long been used in Android development. Today, many Android apps are also built with Kotlin.

Java can be used to build many kinds of programs:

• The server side of websites
• Mobile applications
• Management and business systems
• Programs that work with databases
• Desktop applications
• Network programs
• Games and educational projects
• Automation tools

A simple example

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

This program prints a greeting to the console.

You can start learning Java, but understanding its object-oriented structure and some of its concepts takes time and practice.

These topics are useful at the beginning:

1. Variables and data types
2. Conditional statements
3. Loops
4. Methods
5. Arrays
6. Objects and classes
7. Object-oriented programming
8. Exception handling
9. Collections
10. Working with files and databases

Regular practice and small projects can make the learning process easier.

Advantages

• It can run on different operating systems
• It supports object-oriented programming
• It has a large library and framework ecosystem
• It is used in large software projects
• It has a strong developer community
• It offers tools suited to large systems

Disadvantages

• The code can be long for some simple tasks
• Running on the JVM can require extra memory
• Object-oriented ideas can look difficult to beginners
• A faster or lighter alternative may fit some applications better

Java programs are usually written inside classes. The starting point of a program is the "main" method.

Variables

String name = "Ali";
int age = 20;

Condition

if (age >= 18) {
    System.out.println("Adult");
}

Loop

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

Method

public static int add(int a, int b) {
    return a + b;
}

A greeting

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

The sum of two numbers

public class Main {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;
        System.out.println(a + b);
    }
}

A condition

public class Main {
    public static void main(String[] args) {
        int number = 10;

        if (number > 0) {
            System.out.println("Positive number");
        }
    }
}

What is Java?

Java is an object-oriented programming language that can run on different platforms.

Is Java free?

Free and open-source implementations such as OpenJDK are available. The terms depend on the specific Java distribution.

Can Java be used to build mobile apps?

Yes. Java can be used to build Android applications.

Can Java be used to build a website?

Yes. Java is used to create server-side web applications and APIs.

Do I need to know programming before learning Java?

No. Java can be learned from the beginning.

Are Java and JavaScript the same language?

No. The names are similar, but Java and JavaScript are different programming languages.

Which operating systems does Java run on?

When a suitable Java environment is installed, Java programs can run on systems such as Windows, Linux, and macOS.