Hello World

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Programming Exercise: Hello World Output

This exercise is the universally recognized starting point for every new programmer. Its objective is to demonstrate the simplest working program and introduce the command used for displaying output.

Problem Statement:

Print the exact phrase “Hello World !” in the output.

Requirement:

Print the phrase in a single line.

Example Output:

Hello World !

Java Solution and Breakdown

The solution requires only one key statement: the System.out.println() function, which is responsible for printing information to the console.

1. Complete Java Code

public class HelloWorld {
    public static void main(String[] args) {
        
        // This command prints the content inside the parentheses to the console.
        // The text to be printed is enclosed in double quotes (""), 
        // which makes it a String Literal.
        System.out.println("Hello World !");
    }
}

2. Explanation of Key Concepts

Concept	Description
`public static void main(String[] args)`	This is the entry point of every Java application. All executable code in a simple program must be placed inside the curly braces `{}` of the `main` method.
`System.out.println()`	This is the standard command used to generate output. `System` refers to the standard output system, `out` refers to the output stream, and `println` performs the print operation, automatically moving to a new line afterward.
String Literal	The text `"Hello World !"` is a string literal. In Java (and most programming languages), any sequence of characters enclosed in double quotes is treated as fixed text. This ensures the output is printed exactly as written.
Single Line Output	Because the entire required phrase is placed within a single `System.out.println()` call, the entire output appears on one line, fulfilling the problem’s requirement.