Java is widely used in web and mobile applications, enterprise software, and game development. If you are new to Java, the best place to start is by creating your first program, which is usually a "Hello World" example. In this article, we will walk you through how to create your Simple Java Program using the "Hello World" example.

Simple Java Program | Hello World Example

Step 1: Install Java Development Kit (JDK)

Before we start coding, we need to ensure that weF have the Java Development Kit (JDK) installed on our system. The JDK includes the Java Runtime Environment (JRE), which is necessary to run Java programs, and the Java Development Kit (JDK), which includes all the tools needed to develop Java applications. You can download the JDK from the Oracle website.( Read More ) .

Step 2: Set Up Your Environment 

After installing the JDK, you need to set up your environment. This involves setting up the path variable so that your computer knows where to find the Java compiler and runtime environment. To do this, you need to:

• Open the Start menu and search for "Environment Variables."
• Click on "Edit the system environment variables."
• Click on the "Environment Variables" button.
• In the System Variables section, scroll down to the "Path" variable and click "Edit."
• Add the path to the JDK bin folder, which should be something like "C:\Program Files\Java\jdk1.8.0_231\bin."
• Click "OK" to save the changes. (Read More) .

Step 3: Create a New Java File

Now that your environment is set up, you can start coding your first Java prog

ram. To do this, you need to create a new file with the .java extension. You can use any text editor, such as Notepad or Visual Studio Code, to create this file.

In this example, we will create a file called HelloWorld.java. To do this, follow these steps:

1.Open your text editor.

2.Type the following code into the editor or you can use this editor for see the output of this program:

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

3.Save the file as "HelloWorld.java" in a folder of your choice.

Step 4: Compile and Run Your Program 

After creating the Java file, you need to compile it into bytecode, which can be executed by the Java Virtual Machine (JVM). To do this, open a command prompt and navigate to the folder where you saved the HelloWorld.java file. Then, open cmd(Command Prompt) and find your java file and type the following command:

javac HelloWorld.java

This will compile your program and create a new file called HelloWorld.class.

To run your program, type the following command:

java HelloWorld

This will execute your program, and you should see the output "Hello, World!" displayed in the command prompt.

Congratulations! You have just created your Simple Java Program.

Now let's go through each line of code and explain what it does:

1. public class HelloWorld { }

This line declares a new public class called "HelloWorld". A class in Java is a blueprint for creating objects that have certain properties and behaviors.

2. public static void main(String[] args) { }

This line declares the main method, which is the entry point for the program. "public" means that the method can be called from outside the class, "static" means that the method belongs to the class and not to an instance of the class, "void" means that the method does not return any value, and "main" is the name of the method.

The method takes an array of strings as a parameter, which can be used to pass command line arguments to the program. In this case, we don't need any command line arguments, so we can ignore the "args" parameter.

3. System.out.println("Hello, World!");

This line uses the System.out.println method to print the text "Hello, World!" to the console. System.out is an object that represents the standard output stream, and println is a method that prints the specified text to the console and then adds a newline character at the end.

Conclusion 

Creating a "Hello World" program in Java is a simple but important first step in learning the language. It introduces you to the basic syntax and structure of Java programs and helps you set up your development environment. From here, you can move on to more complex programs and explore the many features of Java.

You Know?

Que 1 : How do I run Hello, World in notepad?

Ans : "Hello, World!" program in Notepad, you need to write the code in Notepad, save it with a .java extension, compile the code using the command prompt or terminal, and then run the program using the java command. Also read Above Article .


Que 2 : How can I practice Java program?

Ans : You can start with "Hello, World!" program or programs that perform simple calculations. As you gain more experience, you can move on to more complex programs. Consistent practice is key to becoming a proficient Java programmer. Make it a habit to practice Java programming on a regular basis. You can set aside a specific time each day or week to practice programming.


Que 3 : How many hours a day should I practice Java?

Ans : the amount of time you should practice Java programming per day depends on your individual goals, schedule, and learning style. Consistency, realistic goals, schedule considerations, focus on quality, and listening to your body are all important factors to consider when determining how much time to dedicate to practicing Java programming.


Que 4 : How to write Java Code in Eclipse?

Ans : Open Eclipse =>create a new Java project=>Name your project=>Choose a JRE=>Configure project settings=>Create a package=>Name your package=>Create a Java class=>Name your class=>Write your Java code=>Save your code.


Que 5: How to format Java code in Eclipse?

Ans : press Ctrl+Shift+F.

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