java_9_after

public class DateRange {
    public DateRange (Date start, Date end) {
        //assignments...
    }
    boolean includes (Date arg) {
        return (arg.equals(this.start) || arg.equals(this.end) || (arg.after(this.start) && arg.before(this.end)));
    }
}
double getFlowBetween (DateRange range) {
    //...
    if (range.includes(each.getDate())) {
        result += each.getValue();
    }
}