How to declare static fields

    private static int numberOfObjects = 0;
    private static double majorityPercent = .51;
    public static final int DAYS_IN_JANUARY = 31;
    public static final float EARTH_MASS_IN_KG = 5.972e24F;

*******************************************************

A class that contains a static constant and a static method
    
    public class FinancialCalculations
    {
         public static final int MONTH_IN_YEAR = 12;
         
         public static double calculateFutureValue(double monthlyPayment, double yearlyInterestRate, int years)
         {
              int months = years * MONTHS_IN_YEAR;
              double monthlyInterestRate = yearlyInterestRate/MONTHS_IN_YEAR/100;
              double futureValue = 0;
              for (int i = 1; i <= months; i++)
            
                   futureValue = (futureValue + monthlyPayment) * (1 + monthlyInterestRate);
             
              return futureValue;  
              
         }

    }

*******************************************************

The Product class with a static variable and a static method

public class Product
{
      private String code;
      private String description;
      private double price;
   
      private static int objectCount = 0;  // declare a static variable

      public Product()
      {
            code = "";
            description = "";
            price = 0;
            objectCount++;       // update the static variable  

      }
      public static int getObjectCount()   // get the static variable
      {
            return objectCount;
      }  
     ...
}
    
page 207