01 package trail.transaction;
02
03 import trail.entity.beans.*;
04 import java.util.Collection;
05
06 public interface Calculator {
07
08 public Collection<TimedRecord> getRecords ();
09 public void updateExchangeRate (double newrate) throws Exception;
10 public void updateExchangeRate2 (double newrate) throws Exception;
11
12 }
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