Set up jar libraries to use in online course

Question

I am having the hardest time setting up IntelliJ 14 so I can use the libraries provided in an online course I am taking instructions. They provide two jar files

stdlib.jar and algs4.jar 

each of which contains several java classes. There is also a data folder that contains text files called

/algs4-data

I created a new project and added these jar files into the

src

folder. Here is what that looks like

So I went into the Project Structure and added the libraries as shown in this screenshot

Now, all of the classes inside of the jar files include a main method which you should be able to call. The problem is that any time I try to run the main method in any of these classes I get an error. For example, typing in the IntelliJ terminal:

Guillermos-iMac:src guillermo$ java StdIn
Error: Could not find or load main class StdIn

This StdIn.java file is inside sodlib.jar and has a main method with the following

/** * Interactive test of basic functionality. */

    public static void main(String[] args) {

    System.out.println("Type a string: ");
    String s = StdIn.readString();
    System.out.println("Your string was: " + s);
    System.out.println();

    System.out.println("Type an int: ");
    int a = StdIn.readInt();
    System.out.println("Your int was: " + a);
    System.out.println();

    System.out.println("Type a boolean: ");
    boolean b = StdIn.readBoolean();
    System.out.println("Your boolean was: " + b);
    System.out.println();

    System.out.println("Type a double: ");
    double c = StdIn.readDouble();
    System.out.println("Your double was: " + c);
    System.out.println();

}

Now, if I right click on the class itself and run it then I get this error popup

which when I choose the module then it runs. I want to be able to run the classes from the terminal so I can pass in arguments (mainly the .txt files in the data folder). I have spent hours trying to figure this out to no avail. Please help!