Error: Could not find or load main class Introductions.class

Doing the very first Java video.

The following code was supplied:

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("Test program here");
  }
}

The video had me add the printf section above.

The file that was given is "Introductions.java"

It instructed me to compile using treehouse:~/workspace$ javac Introductions.java

which I did and it generated the file

Introductions.class

The video then instructed me to run the file using the below: treehouse:~/workspace$ java Introductions.class

Which i did, but I get the following error instead of my printf output reehouse:~/workspace$ java Introductions.class
Picked up JAVA_TOOL_OPTIONS: -Xmx128m
Picked up _JAVA_OPTIONS: -Xmx128m
Error: Could not find or load main class Introductions.class

I understand the "Picked up" parts are just console output for the memory improvements for codetree but the Error below those is what I'm getting even post compilation.

Moderator Edit: Added Markdown to code supplied so it is readable in the Community Post. Please refer to the Markdown CheatSheet when posting code snippets to the Community so it's formatted correctly.