Java8 lambda 常用方法

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Map<String, String> collect = signStates.stream().collect(Collectors.toMap(DictItemQryRsp::getItemValue, DictItemQryRsp::getItemName));

Set<String> strings = tasks.stream().map(Task::getProcessInstanceId).collect(Collectors.toSet());

tasks.stream().filter(item -> item.getProcessInstanceId().equals(processInstance.getId())).findFirst().get().getId();

Map<String, HosDepartmentPO> map = hosDepartmentPOS.stream().collect(Collectors.toMap(HosDepartmentPO::getId, hdsr -> hdsr));