How to Create a Hello World Program in Java Using JDK 25 (Latest Features)�

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How to Create a Hello World Program in Java Using JDK 25 (Latest Features) – A Complete Beginner to Modern Guide (2026)

In this tutorial we are going to learn the new feature of Java 25 which is known as JEP 512: Compact Source Files and Instance Main Methods, which provides a new way of writing Hello World Program. This is a new way of writing Java programs for learning and teaching which removes heavy boilerplate code and replaces it with simple code. In this tutorial we will see the old method of writing Hello World program and also learn the new way of writing Hello World program. So, let's get started.

Introduction

The Hello World program has always been the first stepping stone for anyone entering the world of programming. Beginners starts programming with the Hello World example and this is the program where he learns to create, compile and run Java programs. In Java, Hello World program introduces programmers with Java's structure, compilation process, execution model, and interaction with the Java Virtual Machine (JVM).

JDK 25 Hello World Example

With the release of JDK 25, Java has taken a major leap forward in simplifying the developer experience, especially for beginners. In this comprehensive guide, you will learn every modern and traditional way to create a Hello World program using JDK 25, along with deep explanations, comparisons, execution flow, best practices, and common mistakes. You will learn the old and new methods of creating Hello World programs. We have tested programs given here on OpenJDK 25.

Prerequisites to Run Java 25 Hello World

We are using JDK 25 to run the programs described here so, you must have JDK 25 installed on your machine. Before writing your first program, ensure:

JDK 25 is installed
java and javac commands are accessible
A text editor or IDE (VS Code, IntelliJ, Notepad)

Check your Java version:


java --version

Output should indicate Java 25 or later.

Traditional Hello World Program in Java (Still Fully Supported)

First of all we will learn the traditional (old) way of developing Hello World Program. Java 25 is fully supporting traditional Hello World code and you can follow the steps to run the program. Now we will describe the same steps for you.

Let’s start with the classic approach, which is still widely used in enterprise applications.

Code Example


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

Explanation

public class HelloWorld

Defines a class
Class name must match file name (HelloWorld.java)
Required in traditional Java applications

public static void main(String[] args)

Entry point of Java application
public allows JVM access
static avoids object creation
void indicates no return value
String[] args handles command-line input

System.out.println()

Prints output to console
Automatically moves to the next line

How to Compile and Run Traditional Java Program

Step 1: Compile


javac HelloWorld.java

Step 2: Run


java HelloWorld

Output

Hello, World!

Why Traditional Hello World Still Matters in 2026

Even with new Java features, the traditional structure is essential for:

Spring Boot
Enterprise systems
Android apps
Interviews
Legacy codebases

Understanding this approach is non-negotiable for serious Java developers. As a beginner you should also understand the traditional way of developing Hello World programs.

Single-File Source Code Execution (Modern Java Feature)

Java also supports running the code from the single .java file without compilation. This feature was introduced in Java SE 11 via JEP 330: Launch Single-File Source-Code Programs. This is a good feature for beginners as they can just run the program single .java file without compilation. JDK 25 also provides this feature and we can run the java code using the command java HelloWorld.java.

Java allows you to run a .java file directly, without explicitly compiling it.

Code


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

Run Directly


java HelloWorld.java

Benefits

No separate javac step
Faster development
Ideal for demos and scripting
Great for beginners

Unnamed Classes and Instance Main Methods (JDK 25 Highlight)

Now we will see how to write Hello World programs in Java using its latest feature. This is the Most Important Java Feature for Beginners.

Introduced in JEP 445, unnamed classes revolutionize how Java programs are written. JEP 445: Unnamed Classes and Instance Main Methods

First, the protocol is enhanced by which Java programs are launched to allow instance main methods. Now the main method is not static, need not be public, and need not have a String[] parameter, thus writing a Hello World program is much easier. Here is the example of writing Hello World program in modern way:


class HelloWorld {�
  void main() {�
    System.out.println("Hello, World!");
 }
}

The JEP 445 introduced a Second feature, which is known as unnamed classes to make the class declaration implicit.

Simplest Hello World in Java 25


void main() {
   System.out.println("Hello, World!");
}

What’s Removed?

No class declaration
No static
No access modifiers
No boilerplate

How to Run


java HelloWorld.java

This is the recommended way to start learning Java in 2026. This is a much easier example and easy to run in JDK 25. You can even compile this HelloWorld program into .class and then run as usual.

Why Unnamed Classes Are a Game Changer

Traditional Java


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

Modern Java 25


void main() {
   System.out.println("Hello, World!");
}

Advantages

Reduced cognitive load
Beginner-friendly
Python-like simplicity
Faster learning curve
Ideal for scripting and teaching

Hello World with Command-Line Arguments (Modern Style)


void main(String[] args) {
   System.out.println("Hello, " + args[0]);
}

Run

java HelloWorld.java Java

Output

Hello, Java

How Java 25 Executes a Hello World Program

Regardless of syntax simplicity, Java’s execution model remains robust.

Execution Flow

Source code (.java)
Bytecode generation
Class loading
JVM execution
Output displayed

Writing program using IO class in JDK 25

Now I will show you examples of using the IO class in Java which is coming with JDK 25. This helper class (IO) provides many methods for console input and output, which makes programs simple and more readable. Here Hello world example using JDK 25 and IO class.

Print Hello World:


void main() {
    IO.println("Hello, World!");
}

Here is example of command line arguments:


void main(String [] args) {
    IO.println("Hello, World!");
	IO.println(args[0]);
}

Example of taking input from user and then printing on console:


// No explicit import needed as it is in java.lang
public class HelloWorld {
    public static void main(String[] args) {
        IO.print("Enter your name: "); // Prints a prompt without a newline
        String name = IO.readln();     // Reads a line of text

        IO.print("Enter your age: ");
        String age = IO.readln(); 

        IO.println("Hello, " + name + "! You are " + age + " years old.");
    }
}

Here is the screenshot of the program:

java 25 user input example

Java hides complexity without removing it.

Java 25 vs Older Java Versions (Hello World Comparison)

Feature	Java 8	Java 17	Java 25
Boilerplate	High	High	Low
Direct Execution	❌	❌	✅
Unnamed Classes	❌	❌	✅
Beginner Friendly	❌	⚠️	✅

Common Mistakes Beginners Make in Java 25

❌ Using New Syntax on Old JDK

void main() { }

Fails on Java < 21

❌ File Name Issues

Must end with .java

❌ Missing Semicolons

System.out.println("Hello")

❌ Case Sensitivity Errors

system.out.println()

Best Practices for Hello World in Java 25

Start with unnamed classes
Progress to traditional Java
Understand JVM basics
Practice command-line execution
Avoid IDE dependency early

Why Java Simplified Hello World in JDK 25

Java aims to:

Compete with Python and JavaScript
Lower entry barriers
Attract new developers
Maintain enterprise dominance

Java now offers:

Simple syntax for beginners
Powerful runtime for enterprises

What to Learn After Hello World

Once you’re comfortable, move on to:

Variables and data types
Control statements
Methods and classes
OOP concepts
Exception handling
Collections
Multithreading

Learning Java properly starts with Hello World.

FAQs – Hello World in Java 25

Is Hello World still relevant?

Yes, it verifies the environment and teaches fundamentals.

Which syntax should beginners use?

Unnamed classes (void main()).

Can enterprises use unnamed classes?

No, they are mainly for learning and scripting.

Does Java 25 replace traditional Java?

No, it complements it.

Final Recommendation (2026+)

If you are new to Java, start with:


void main() {
   System.out.println("Hello, World!");
}

Then gradually move to traditional Java as you learn OOP and frameworks.

Conclusion

The Hello World program in Java JDK 25 represents more than just printing text—it reflects Java’s evolution into a modern, beginner-friendly language without losing its enterprise power.

Java in 2026 is:

Simple ☕
Powerful 💪
Future-proof 🚀

Mastering Hello World is your first step toward Java mastery.

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