Error: Could not find or load main class : <p>I am new to java and I am currently trying to run a program for a class assignment and it compiles however, every time I run it I get this error "Error: Could not find or load main class sailboat.java"  To make things worse I need to submit this in a different way from standard assignments logging onto the main server of my campus and transfer it from my directory to another yet every time I do it, it tells me it can't open the source file.</p>

<p>Would these two situations because by the same thing?   Is this something caused by a mistake in my code, or is it something wrong with my Classpath?</p>

<p>here's the code I made, I used notepad++ </p>

<pre><code>import java.text.*;
import java.io.*;
import java.math.*;

public class sailboat {
    public static void main (String argv []) throws IOException {
        BufferedReader stdin =
                new BufferedReader (new InputStreamReader (System.in));
        String inputValue;


        //Tartan 34C Title
        System.out.println("Sailboat: Tartan 34C");
        //Tartan 34C inputs
            double LOA = Double.parseDouble("34.50");
            double LWL = Double.parseDouble("24.00");
            double beam = Double.parseDouble("10.20");
            double displace = Double.parseDouble("11200.00");
            double displace_Ton = Double.parseDouble("5.60");
            double sail_Area = Double.parseDouble("483.00");


            //Hull Speed Formula
            double hull_Speed = Math.sqrt(LWL) * 1.34; 
                System.out.println("Hull Speed:" + hull_Speed);


            //Displacement to Waterline Length Formula
            double displace_Lng =  displace_Ton / 0.01 * Math.pow(LWL, 3.0);
                System.out.println("Displacement to water lenght:" + displace_Lng);


            //Sail Area to Displacement Formula
            double sail_Area_Displace = sail_Area / Math.pow((displace / 64), 0.67);
                System.out.println("Sail Area to displacement:" + sail_Area_Displace);


            //Capsize Screening Index Formula
            double Cap_I = beam / Math.pow((displace / 64), 0.33);
                System.out.println("Capsize Screening Index:" + Cap_I);


            //Comfort Index Formula
            double Comf_I = displace / (0.7 * LWL + 0.3 * LOA) * 0.65 * Math.pow(beam, 1.33);
                System.out.println("Comfort Index:" + Comf_I + "\n");
</code></pre>

<p>any input would be helpful.</p>
