Can someone help with this simple application

Question

I am taking my first java class and there are limited resourses for the class as far as getting help with coding.
Any hoo if any one can point me in the correct direction from the following information listed below I would be greatfull. I am trying to use the set and get methods on the instance veriables and then I am goign to post the results once I get them workign to a JOption pane window.
examples are most welcome thanks
// Invoice.java
// Homework assignment 3.13
// Student Arthur Clark
public class Invoice // public class
String partNumber;// instance veriable quantity
String partDescription;// instance verialbe partDescription
//constructors
public void setpartNumber( String number, String description )
          partNumber = number; //initalize quantity
          partDescription = description; // initalize partDescription
     }// end constructors
//method getpartNumber
public String getpartNumber()
          return partNumber;
     }//end method getpartNumber
public String getpartDescription()
          return partDescription;
     }// end method getpartDescription
public void displayMessage()
     //this is the statement that calls getpartNumber
     System.out.printf(" part number # \n%s!\n the description", getpartNumber(), getpartDescription() );
} // method displaMessage
}// end method main
// Fig. 3.14 InvoiceTest.java
// Careate and manipulate an account object
import java.util.Scanner;
import javax.swing.JOptionPane;//import JOptionPane
public class InvoiceTest{
     // main method begins the exciution of the program
     public static void main ( String args [] )
          // create Scanner to obtain input from mommand window
          Scanner input = new Scanner ( System.in );
          // create a Invoice object and assig it to mymethod
          Invoice myMethod = new Invoice();
          Invoice myMethod2 = new Invoice();
          // display inital value of partName, partDescriptoin
          System.out.printf( "inital partname is %s\n\n", myMethod.getpartNumber() );
          // prompt for and read part name, partDescription
          System.out.println( "please enter the Part Number:" );
          String theNumber = input.nextLine(); // read a line of text
          myMethod.setpartNumber( theNumber ); // set the part name with in the parens
          System.out.println();// outputs blank line
          myMethod.displayMessage();
          System.out.println( "please enter the Part Description" );
          String theDescription = input.nextLine(); // read a line of text
          myMethod2.setpartDescription( theDescription );// set the part description
          System.out.println();// outputs blank line
          myMethod2.displayMessage();
     }// end main mehtod
}// end class

Answer 1

//constructors
public void setpartNumber( String number, String description )
          partNumber = number; //initalize quantity
          partDescription = description; // initalize partDescription
     }// end constructorsThe above code is not a constructor. You do not include a return type, void or anything else. Also, the constructor should be called the same as your class.
public Invoice( String number, String description )
          partNumber = number;
          partDescription = description;
     } Another thing, comments should only be used when it isn't bleedingly obvious what your code is doing.
P.S. is your middle initial C?