假设我有一个实现以下接口(interface)的对象列表:publicinterfaceSummable{Tadd(To1);}假设我还有一些能够对这些对象求和的类:publicclassCalculator>{publicTsum(finalListobjects){if(null==objects){thrownewIllegalArgumentException("Ups,listofobjectscannotbenull!");}TresultObject=null;for(Tobject:objects){resultObject=object.add(resultObjec