New to Java

I am trying to make a comand line calculator that will calculate the profit from buying a stock at a certain price then selling it at another price.
Here is what I have so far.

package stockprofitcalc;



/**

 *

 * @author wolney1

 */

public class Main {



    /**

     * @param args the command line arguments

     */

    public static void main(String[] args)



            throws java.io.IOException {

        // TODO code application logic here

    calcM stockCalc = new calcM();

    stockCalc.calc();

    }}




package stockprofitcalc;



/**

 *

 * @author billolney

 */

public class calcM {

    float bPrice=0;

    float sPrice=0;

    float quantity=0;

    float commision=40;

    float profit=0;



    public void calc()

            throws java.io.IOException {

        System.out.println("Buy Price:");

        bPrice= (float) System.in.read();

System.in.read();

        System.out.println("Sell Price:");

        sPrice= (float) System.in.read();

System.in.read();

        System.out.println("Quantity:");

        quantity= (float) System.in.read();

System.in.read();

        profit=(((sPrice-bPrice)*quantity)-commision);

        System.out.println("Profit:" + profit);

        System.out.println(commision);



    }}

when I run it all the calculatons are wrong.
Bill