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+package innovimax.mixthem.interfaces;%0A%0Aimport innovimax.mixthem.exceptions.MixException;%0A%0A/**%0A* This interface provides for joining two lines%0A* @author Innovimax%0A* @version 1.0%0A*/%0Apublic interface IJoinLine %7B%0A%09/**%0A %09* Joins two lines on a common field.%0A %09* @param line1 The first line to be joined%0A %09* @param line2 The second line to be joined%0A %09* @return The result of joining lines, or null if no join possible%0A %09* @throws MixException - If an joining error occurs%0A %09*/%09%0A%09String join(String line1, String line2) throws MixException;%0A%7D%0A

Create IJoinLine.java