Here is an outline for a working class OldCellPhone that has no errors (you may see this exact class several times in this exam):
 
class OldCellPhone
{
   static public final int MIN_CAP = 10;
   static public final int MAX_CAP = 1000;
   static public final String DEFAULT_DSCR = "(generic phone)";
 
   private String description;
   private int   memCapacity;
   private boolean   camera;
   private boolean   gps;    
 
   public void setCamera( boolean hasCam ) { camera = hasCam; }
   public void setGps( boolean hasGps ) { gps = hasGps; }
 
   public OldCellPhone()
   {
      this(DEFAULT_DSCR, MIN_CAP, false, false);
   }
 
   public OldCellPhone(String dscr, int mem, boolean cam, boolean gp)
   {
      // not shown
   }
 
   public String toString()
   {
      // not shown
   }
 
   public boolean setMemCapacity(int mem)
   {
      // not shown
   }
};
A programmer decides to make the static DEFAULT_DSCR mutable, removing its final status, as in:
 
   static public String DEFAULT_DSCR = "(generic phone)";
A mutator is added for this member. Any String whose length is at least 2 characters will be acceptable as a new DEFAULT_DSCR. 
 
Check the true statements (there may be more than one correct answer):
 
 
 
    A.  The mutator for this member will be an instance method.
    B.  If the mutator takes a String parameter, newDefault, a reasonable definition would be:
      if ( newDefault.length() < 2 )
         return false;
      DEFAULT_DSCR = newDefault;
      return true;
    C.  The mutator for this member will be a static method.
    D.  If the mutator takes a String parameter, newDefault, a reasonable definition would be:
   if ( newDefault.length() < 2 )
   {
      this.newDefault = DEFAULT_DSCR;
      return false;
   }
   this.newDefault = newDefault;
   return true;
    E.  If the mutator takes a String parameter, newDefault, a reasonable definition would be:
   if ( newDefault.length() > 0 )
      return false;
   DEFAULT_DSCR = newDefault;
   return true;