src/org/ohmage/domain/campaign/Campaign.java
public void addAuthorList(
			final Collection<String> authors) 
			throws DomainException {
		
		if(authors == null) {
			throw new DomainException("The author list is null.");
		}
		
		authorList.addAll(authors);
	}
/**
	 * Adds a collection of classes to the already existing collection of 
	 * classes.
	 * 
	 * @param classIds The collection of class IDs to add.
	 * 
	 * @throws DomainException Thrown if the class ID list is null.
	 */
Adds a collection of classes to the already existing collection of
classes.

@param classIds The collection of class IDs to add.

@throws DomainException Thrown if the class ID list is null.
Adds a collection of classes to the already existing collection of classes . @param classIds The collection of class IDs to add . @throws DomainException Thrown if the class ID list is null .
public void addAuthorList(
			final Collection<String> authors) 
			throws DomainException {
		if(authors == null) {
			throw new DomainException("The author list is null.");
		}
		authorList.addAll(authors);
	}
public void addAuthorList ( final Collection < String > authors ) throws DomainException { if ( authors == null ) { throw new DomainException ( "The author list is null." ) ; } authorList . addAll ( authors ) ; }
Adds a collection of classes to the already existing collection of
 classes.
Adds a collection of classes to the already existing collection of classes .