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Simple Java Program And Explanation | first java program and explanation | Simple Java programs for beginners | first java program | hello world

Here is an example of a simple Java program that prints "Hello, World!" to the console:

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


This program consists of a single class named "HelloWorld". The class contains a single method named "main", which is the entry point of the program. The "public" keyword indicates that the class and method can be accessed from outside the class.

The "main" method takes an array of strings as an argument named "args". This argument is not used in this program, but it can be used to pass command-line arguments to the program.

Inside the "main" method, the "System.out.println" statement prints the string "Hello, World!" to the console. The "println" method adds a new line after the string, so the output appears on a separate line.

To run this program, you need to compile it first. Here are the steps to compile and run the program:

1. Save the code in a file named "HelloWorld.java". Make sure to use the same class name as the filename.

2. Open a command prompt or terminal window and navigate to the directory where the file is saved.

3. Type the following command to compile the program:

javac HelloWorld.java

This will generate a file named "HelloWorld.class" in the same directory.

4. Type the following command to run the program:

java HelloWorld

This will execute the program and print "Hello, World!" to the console.

That's it! You have successfully written and executed your first Java program.


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