GenericItem(int id,
    String name) 
{
        this.id = id;
        this.name = name;
        complete = false;
}

 public static String displaySize(int n) 
{
        if (n< 2048)
            return "" + n + " B";
        float f = (float)n;
        f /= 1024;
        if (f< 2048)
            return "" + (Math.round(f*10.)/10.) + " kB";
        f /= 1024;
        if (f< 2048)
            return "" + (Math.round(f*10.)/10.) + " MB";
        f /= 1024;
        return "" + (Math.round(f*10.)/10.) + " GB";
}

 public static String displayTime(int n) 
{
        if (n <  0) {
            return "Unknown";
        } else if (n <  50) {
            // Below 50s: 1s, 2s, ... up from 2%
            return  "~ " + n + " s";
        } else if (n < = 5*SEC_PER_MIN) {
            // From 50s to 5m: 1m 10s, 1m 20s, ... down from 20% to 3.3%
            int min = n / SEC_PER_MIN;
            int sec = ((n%SEC_PER_MIN) / 10) * 10;
            if (sec >0)
                return  "" + min + " m " + sec + " s";
            else
                return  "" + min + " m";
        } else if (n < = 20*SEC_PER_MIN) {
            // From 5 to 20 minutes: 1m, 2m... down from 20% to 5%
            int min = (n+SEC_PER_MIN/2) / SEC_PER_MIN;
            return  "~ " + min + " m";
        } else if (n < = SEC_PER_HOUR) {
            // From 20 minutes to 1 hour : 5m; 10m, ... down from 25% to 8.4%
            int min = ((n+SEC_PER_MIN/2) / SEC_PER_MIN / 5) * 5;
            return  "~ " + min + " m";
        } else if (n <  5*SEC_PER_HOUR) {
            // From 1 to 5 hour: 1h 10m, 1h 20m, ... down from 17% to 3.3%
            int hours = n / SEC_PER_HOUR;
            int min = (((n%SEC_PER_HOUR)+SEC_PER_MIN/2) / SEC_PER_MIN / 10) * 10;
            if (min >0)
                return "" + hours + " h " + min + " m";
            else
                return "" + hours + " h";
        } else if (n < = SEC_PER_DAY) {
            // From 5 to 24 hours: 1h, 2h, ... down from 20% to 4%
            int hours = (n+SEC_PER_HOUR/2) / SEC_PER_HOUR;
            return  "" + hours + " h";
        } else if (n <  5*SEC_PER_DAY) {
            // From 1 to 5 days: 2d 4h, 2d 8h, ... down from 17% up to 3.3%
            int days = n / SEC_PER_DAY;
            int hours = (((n%SEC_PER_DAY)+SEC_PER_HOUR/2) / SEC_PER_HOUR / 4) * 4;
            if (hours >0)
                return "" + days + " d " + hours + " h";
            else
                return "" + days + " d";
        } else {
            // Above 5 days: 5 d, 6 d, ... down from 20% to 0%
            int days = (n+SEC_PER_DAY/2) / SEC_PER_DAY;
            return "" + days + " d";
        }
}

Tries to display an approximation of 10%, always between 5% and 20%

 public boolean equals(Object o) 
{
        if (!(o instanceof GenericItem))
            return false;
        GenericItem item = (GenericItem)o;
        if (id()!=item.id())
            return false;
        if ((name()==null && item.name!=null) || (name()!=null && !name().equals(item.name())))
            return false;
        if (size()!=item.size())
            return false;
        if ((hash()==null && item.hash!=null) || (hash()!=null && !hash().equals(item.hash())))
            return false;
        return true;
}

 public final String hash() 
{
        return hash;
}

 public final int id() 
{
        return id;
}

 public final String name() 
{
        return name;
}

 public final int nbClients() 
{
        return nbClients;
}

 public final String prettySize() 
{
        return displaySize(size);
}

 public static boolean sameList(List list1,
    List list2) 
{
        if (list1.size()!=list2.size())
            return false;
        for(int i=0; i< list1.size(); i++) {
            GenericItem item1 = (GenericItem)list1.get(i);
            GenericItem item2 = (GenericItem)list2.get(i);
            if (!item1.equals(item2))
                return false;
        }
        return true;
}

 public  void setNbClients(int nb) 
{
        this.nbClients=nb;
}

 public final int size() 
{
        return size;
}