code: public void fire(String methodName, Object arg) {
  		if (listeners != EMPTY_OBJECT_ARRAY) {
  			fireEventByReflection(methodName, new Object[] { arg });
  		}
  	}
docs: Invokes the method with the given name and a single parameter on each of the listeners
  registered with this list.
  
  @param methodName the name of the method to invoke.
  @param arg the single argument to pass to each invocation.
  
  @throws IllegalArgumentException if no method with the given name and a single formal
  parameter exists on the listener class managed by this list helper.