java|java8函数式编程--- 代码重构，抽出方法 java|java

真实开发中，类肯定很多，但是他们会执行相同的操作，如下

/** * 获取单位统计销售数据 * @param query */ private void getAllTypeSalesUnitMap(OrdersSalesStatQuery query) { List allTypeSalesUnitList = orderTimerService.listSlaveAllTypeOrdersStat(QueryType.UNIT, query); allTypeSalesUnitPieceMap = allTypeSalesUnitList.stream().filter(item -> item.getUnitName().equals("件")).collect(Collectors.toMap(AllTypeOrdersSalesUnitStat::getOrderType,v->v,(v1,v2) -> v1)); allTypeSalesUnitPacketMap = allTypeSalesUnitList.stream().filter(item -> item.getUnitName().equals("包")).collect(Collectors.toMap(AllTypeOrdersSalesUnitStat::getOrderType,v->v,(v1,v2) -> v1)); }/** * 获取dlt单位统计销售数据 * @param dltQuery */ private void getDltAllTypeSalesUnitMap(DltOrdersSalesStatQuery dltQuery) { List dltAllTypeSalesUnitList = dltOrderCoreService.listSlaveAllTypeOrdersStat(QueryType.UNIT, dltQuery); dltAllTypeSalesUnitPieceMap = dltAllTypeSalesUnitList.stream().filter(item -> item.getUnitName().equals("件")).collect(Collectors.toMap(DltAllTypeOrdersSalesUnitStat::getOrderType,v->v,(v1,v2) -> v1)); dltAllTypeSalesUnitPacketMap = dltAllTypeSalesUnitList.stream().filter(item -> item.getUnitName().equals("包")).collect(Collectors.toMap(DltAllTypeOrdersSalesUnitStat::getOrderType,v->v,(v1,v2) -> v1)); }/** * 获取单位统计销售退货数据 * @param query */ private void getAllTypeRefundUnitMap(OrdersSalesStatQuery query) { List allTypeRefundUnitList = orderTimerService.listSlaveAllTypeOrdersStat(QueryType.REFUND_UNIT, query); allTypeRefundUnitPieceMap = allTypeRefundUnitList.stream().filter(item -> item.getUnitName().equals("件")).collect(Collectors.toMap(AllTypeOrdersRefundUnitStat::getOrderType,v->v,(v1,v2) -> v1)); allTypeRefundUnitPacketMap = allTypeRefundUnitList.stream().filter(item -> item.getUnitName().equals("包")).collect(Collectors.toMap(AllTypeOrdersRefundUnitStat::getOrderType,v->v,(v1,v2) -> v1)); }

然后Idea 就提示我 duplicates 了，所以要重构一下
要抽成方法的代码：

list.stream().filter(item -> item.getUnitName().equals("包")).collect(Collectors.toMap(DltAllTypeOrdersRefundUnitStat::getOrderType,v->v,(v1,v2) -> v1));

用java8函数式编程来进行方法的抽取：

private Map unitListConvertToMap(List list, Predicate supplier1, Function supplier) { Map map = list.stream().filter(supplier1).collect(Collectors.toMap(supplier,v->v,(v1,v2) -> v1)); return map; }

使用：

private void getDltAllTypeRefundUnitMap(DltOrdersSalesStatQuery dltQuery) { List list = dltOrderCoreService.listSlaveAllTypeOrdersStat(QueryType.REFUND_UNIT, dltQuery); dltAllTypeRefundUnitPieceMap = this.unitListConvertToMap(list,item -> item.getUnitName().equals("件"),DltAllTypeOrdersRefundUnitStat::getOrderType); dltAllTypeRefundUnitPacketMap = this.unitListConvertToMap(list,item -> item.getUnitName().equals("包"),DltAllTypeOrdersRefundUnitStat::getOrderType); }

【java|java8函数式编程--- 代码重构，抽出方法】