Final Answer: The correct answer to print "Hello World" in Java is option C: System.out.println("Hello World"); . This syntax uses the System class and println() method, and it's important to remember that Java is case-sensitive. Other options provided do not represent valid Java syntax for printing to the console. ; Explanation: The correct syntax to print "Hello World" to the console in Java is: System.out.println("Hello World"); In Java, the System class provides a standard output stream called out , and the println() method is used to print the string provided to it. This method takes a single parameter, which is the string you want to display on the console. It is essential to use double quotes around the string to indicate that it is a string literal. Regarding the other options: A. echo("Hello World"); : This syntax is used in PHP, not Java. B. print("Hello World"); : This is also incorrect for Java; it is valid in some other languages like Python but isn't standard in Java. C. System.out.println("Hello World"); : This is the correct answer, as explained above. D. System.out.println('Hello World') : This is incorrect because single quotes are used for character literals in Java, not for strings. Java's syntax is case-sensitive, meaning that you must use the exact capitalization for constructs like System and println . Therefore, the right way to achieve the desired output is by using option C . ; Examples & Evidence: An example of using System.out.println is within a main method in a Java program: public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World"); } } You can find documentation on Java's System class and its methods in official Java resources, which confirm that System.out.println("Hello World"); is the correct syntax for output in Java.

Because it has no main() method where the code would take the starting point. Use this

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

Please note there are some of the things you should always take a note of while programming. Which is also known as the syntax of the language.

Java requires you to have the class written as the FileName, HelloWorldClass is the name of the file of yours.

Then, any data type of it. In my case it is void which means it won't return anything to you in the end.

Also, you should write String[] args which is the Parameter to the method. I was last night trying to understand why I should write these? There is a method, which runs without these, but Java recommends you to add the parameters.

If you've already been programming for a year, I guess I'll skip the really basic stuff. This defines a class called HelloWorld. Everything defined in Java has to live within a class. This source file, when compiled, will become a file called HelloWorld.class. There can be directives that exist outside a class (e.g. package and import). These are directives to the compiler. They influence how the compiler behaves while compiling that one file, but they do not "define" anything new, so they don't get placed inside the class. This class has a single method, main. The method has two modifiers: public - the method is available to callers that exist outside this class. static - the method can be called without first creating an instance of the class. The signature of a main method has to look like this. It has to be public and static, it has to return void, and it has to take a String array as a parameter. If you tweak that signature and then try to run the class, it won't work. The JVM won't be able to find a valid main method. System is a class in java.lang . But the package java.lang is automatically imported. That's why you don't need to write java.lang.System.out.println nor do you need an explicit import of java.lang. This is the only package that works this way. System has a static final field called out with type PrintStream . It's rare to expose fields in this way, but I suspect this was done for performance reasons. Like a static method, a static field can be accessed without creating an instance of the class. Because the field is final, its value cannot be swapped to reference a different PrintStream. And println is just a regular instance method on PrintStream. Dunno if that is what you wanted.