custom made up date class with calendar

[infernocy]

Hallo

Below is the Rentable class where i have some trouble with assigning some fields
first i need three dates the default date , a return date , and the service date --
in the code bellow vServiceDate in the constructor has that value - is it possible to create a new field and get that value from like what i did .
The next is can i assign a calendar to show the default date
basically i have trouble in how to compare the three fields i need

thanks for all the help

public class RentableCar extends Car implements Rentable
{
   public Date defaultDate; 
   public Date returnDate;
   public Date newSdate;
    /**
     * Constructor for objects of class RentableCar
     */
    public RentableCar(String vCode , String vHomeDepot , String vMake , Date vServiceDate , String newFuel ,
      int newEngineSize , int   Trans , Date newDefaultDate , Date newReturnDate   )
      {
       super(vCode , vHomeDepot , vMake , vServiceDate ,  newFuel ,  newEngineSize ,  Trans);
        defaultDate = newDefaultDate;
        returnDate = newReturnDate;
        newSdate  = vServiceDate;
    }
    
    public  boolean pickUp(Date d) {
    return true;
    }
    
      public boolean isRented(){
    if(( returnDate != newSdate ) && (returnDate != defaultDate)) {
    return false;
    }
     else {
      return true;
        }
    }   
    public Date getReturnDate(){
    return defaultDate;
    }
   public void dropOff(){
    }
}

[KevinWorkman]

When comparing Objects, don't use == or !=. Use the .equals() method instead. The == operator tests whether two Objects are the same instance. The .equals() method tests for semantic equality.