Date to Calendar Conversion

I want to convert following class file from Date to Calendar
pls guide me how shall i go about it
package com.utility;
import java.util.Date;
public class ConstDate extends Date {
     public ConstDate(Date d)
        super(d.getTime());
    public ConstDate(long time)
        super(time);
    public void setTime(long time)
        throw new UnsupportedOperationException("Can not set time on ConstDate");
    public static ConstDate make(Date date)
        return (date instanceof ConstDate) ? (ConstDate)date : new ConstDate(date);
}when i tried to do it said i need to implement the abstract methods, i want to know how can i go about doing the same too
thanks in advance
regards
Prad

Great, but the demand is to change from date to calendar so how can i extend it from interface i have made something like this
import java.util.Calendar;
public interface AbstractConstCalendar{
     public abstract Calendar add(int i, int j);
    public abstract Calendar computeFields();
    public abstract Calendar computeTime();
Note: i just changed the above class file name from ConstDate to ConstCalendar
how can i call this in above ConstCalendar Class, will this help
regards
prad

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Eskarina wrote:
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