com.javarush.task.task36.task3612

Solution.java

package com.javarush.task.task36.task3612;

import java.util.Date;
import java.util.HashSet;
import java.util.Set;

/* 
Почему сет не содержит элемент?
*/

public class Solution
{
      private Set<Date> dates;
      private Date      lastDate;

    public static void main(String[] args)
        {
        Solution solution = new Solution ( );
        solution.initializeDates ( );
        solution.updateLastDate ( 3_600_000L );
        System.out.println ( solution.isLastDateContainsInDates ( ) );
        }

    public boolean isLastDateContainsInDates()
        {
        return dates.contains ( lastDate );
        }

    private void initializeDates()
        {
        dates = new HashSet<> ( );
        lastDate = new Date ( 9999999L );
        dates.add ( lastDate );
        dates.add ( new Date ( 2222222L ) );
        dates.add ( new Date ( 3333333L ) );
        dates.add ( new Date ( 4444444L ) );
        dates.add ( new Date ( 5555555L ) );
        }

    protected void updateLastDate(long delta)
        {
         dates.remove ( lastDate );
        lastDate.setTime ( lastDate.getTime ( ) + delta );
        dates.add (lastDate);
        }
}