NoClassDefFound Error

I am new to JAVA and this is my first class assigment.  The following code 
compiles clean but when I run thr program I get a run time error listed below 
the code.  Can you point to what I need to do to correct this?
  Thanks
  Ron Newman
   
   
  // Ronald Newman
   
  import java.text.NumberFormat;
   
  public class Land  {
   public static void main(String [] args) {
   
      NumberFormat decimalA = NumberFormat.getInstance();
      decimalA.setMinimumFractionDigits(0);
   
      NumberFormat decimalB = NumberFormat.getInstance();
      decimalB.setMinimumFractionDigits(3);
   
   
   
  final int FEET_PER_ACRE = 43560;
  double tract = 398767, acres;
  acres = tract / FEET_PER_ACRE;
   
  System.out.println("\n\n A Track of land " + decimalA.format(tract) + " 
Square feet has " + decimalB.format(acres) + " acres. \n\n");
   
     }   // end of main
  }  // end Land class
   
   
   
  <INACOMS8><INACOMS8>C:
  cd \WDSC\
  java Land
   
  C:\wdsc>
  C:\wdsc>
  C:\wdsc>java.lang.NoClassDefFoundError: Land
  Exception in thread "main"
  C:\wdsc>
   



                
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