Java 8 Lambda - 两个列表的交集 [英] Java 8 Lambda - Intersection of Two Lists
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问题描述
我试图根据某些条件并执行一些步骤来查找两个列表的 intersection
.找不到方法(在学习阶段):)
I am trying to find intersection
of two lists based on some condition and doing some steps. Couldn't find a way to do it (in learning stage) :)
Double totalAmount = 0.00d;
Double discount = 0.00d;
List<OrderLineEntry> orderLineEntryList = orderEntry.getOrderReleases().stream()
.flatMap(orderReleaseEntry -> orderReleaseEntry.getOrderLines().stream())
.filter(orderLineEntry -> orderLineEntry.getStatus().equals("PP") || orderLineEntry.getStatus().equals("PD"))
.collect(Collectors.toList());
for (OrderLineEntry orderLineEntry : orderLineEntryList) {
for (SplitLineEntry splitLineEntry : splitReleaseEntry.getLineEntries()) {
if (splitLineEntry.getOrderLineId().equals(orderLineEntry.getId()) && splitLineEntry.getStatusCode() != "PX") {
totalAmount += orderLineEntry.getFinalAmount();
couponDiscount += orderLineEntry.getCouponDiscount() == null ? 0.00d : orderLineEntry.getCouponDiscount();
}
}
}
如你所见,逻辑很简单
根据一些过滤器list
从订单中获取所有项目,并与另一个list
相交并做一些事情.
Get All items from order based on some filter list
and intersect with another list
and do some stuff.
推荐答案
最简单的方法是:
List<T> intersect = list1.stream()
.filter(list2::contains)
.collect(Collectors.toList());
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