Cohesion

• A class should represent a single concept
• The public interface of a class is cohesive if all of its features are related to the concept that the class represents
• This class lacks cohesion:
  

  public class CashRegister
  {
     public void enterPayment(int dollars, int quarters, int dimes,
                              int nickels, int pennies)
     . . .
     public static final double NICKEL_VALUE = 0.05;
     public static final double DIME_VALUE = 0.1;
     public static final double QUARTER_VALUE = 0.25;
     . . .
  }