Having trouble with tutorial 1 seems to all be working until I get to Java Introductions and then it reads error??

Having trouble with tutorial 1 seems to all be working until I get to Java Introductions and then it reads error: Could not find or load main class introduction. The first part reads

import java.io.Console; public class Introductions { public static void main(String[] args) { Console console = System.console(); // Welcome to the Introductions program! Your code goes below here console.printf("Hello,my name is Elisha"); } }

and the console bit reads: javac Introductions.java ls java Introduction (this is where the error is?) the error reads "Error: could not find or load the main class introduction.

How can I fix this? Sorry I have no programming experience