我正在研究构建器模式，但遇到了如何向新创建的对象添加新“属性”的问题:publicclassMsProjectTaskData{privatebooleanisAlreadyTransfered;privateStringreq;publicstaticclassBuilder{privatebooleanisAlreadyTransfered=false;publicBuilderwithTransfered(booleanval){isAlreadyTransfered=val;returnthis;}publicMsProjectTaskDatabuild(){returnnew