I'm not seeing what I'm doing wrong (or multiple things, probably). You
should be able to call a method for an object by object.method(); but
it's not giving me that. I'm getting method(double) cannot be applied to
(). I'm missing something fundamental. I have examples and they work so
the problem's me. I need to know the why of what's going wrong. The book
and the class lectures on the topic are a little....thin.

Here's what I have so far. I got the PayCheck class to compile but
TestPayCheck won't. I keep running into the method error message or this
really cute one, non-static method display() cannot be referenced from a
static context. Huh? I haven't declared anything static. Great, except I
haven't declared anything static.

Here's the code, please keep the heckling to a minimum.

/**
* PayCheck.java Chapter 4.
*
*@author    (Munged - I didn't write it. It's a class exercise)
*@since     January 28, 2004
*@re-created   September 17, 2004
*/
public class PayCheck {
   
   public double workHours;
   private double grossPay;
   public double netPay;
   public double withHoldingRate;
   public double hourlyRate;
   
   // instance variables

   /**
    * Constructor for the Pay object
    *
    *@param workHours      
    *@param hourlyRate              
    *@param withHoldingRate            
    *@since
    */
   public PayCheck(double workHours,
       double withHoldingRate,
       double hourlyRate) {
       
        //calls setWorkHours, setWithHoldingRate and setHourlyRate
           
       setWorkHours(workHours);
       
       //reserves the variable for whatever you use for the next class.
       
       setWithHoldingRate(withHoldingRate);
       setHourlyRate(hourlyRate);
       netPay = (workHours * hourlyRate) - (workHours * hourlyRate *
withHoldingRate);
       
   }
       
       // needed to put netPay up here in addition to putting it in the
       // constructor() obj
 

   /** call Constructor for the PayCheck object using no arguments */
   
   public PayCheck() {}
       
   /**
    * Sets the workHours attribute of the PayCheck object
    *
    *@param workHours  The new workHours value
    */
   public void setWorkHours(double workHours) {
       
       this.workHours = workHours;
       
   }
   
   /**
    * Sets the withHoldingRate attribute
    *
    *@param withHolding - the new withHoldingRate value
    */
   
    public void setWithHoldingRate(double withHoldingRate) {
        this.withHoldingRate = withHoldingRate;
    }
   
    /**
     * Sets the hourlyRate attribute
     *
     * @param hourlyRate - the new hourlyRate value
     */
   
    public void setHourlyRate(double hourlyRate) {
        this.hourlyRate = hourlyRate;
    }

   /**
    * Sets the netPay variable
    *
    *@since
    */
   public void setNetPay(double workHours, double hourlyRate, double
withHoldingRate) {
     
       netPay = (workHours * hourlyRate) - (workHours * hourlyRate *
withHoldingRate);

   }
    public double getNetPay(double netPay) {
       
        return netPay;
    }

   /**
    * Description of the Method
    *
    *@since
    */
   public void display() {
       System.out.println("The net pay " + "for " + workHours + " hours
worked " +
       " at a rate of " + hourlyRate + " is " + netPay + ", assuming a
withholding rate of " +
       withHoldingRate);
       
   }
}

/**
* This class tests the Testpaycheck class
*
*@author    (Munged)
*@since     Sept 18, 2004
*@created  
*/
public class TestPayCheck {

   // Declare instance variables for the class TestPayCheck.
   
   private double check1;
   private double check2;

      // construction method
   public void processPayChecks() {
       
       
       
       //instantiate objects
       // Class (name) = new Class();
       
       
       PayCheck check1 = new PayCheck(40.0, 4.65, .15);
       //creates object by sending the three arguments.
       //workHours, hourlyRate, withHoldingRate
       
       PayCheck check2 = new PayCheck();
       //creates object by sending NO arguments.

       check2.setWorkHours(35);
       check2.setHourlyRate(10.50);
       check2.setWithHoldingRate(.17);
       
       check1.getNetPay();
       
       
   }
         

}