JAVA对象合集，根据条件过滤

ApplyRecord model = RecordService.getById(Apply.getId());

List<Flow> flowList = Service.queryList(model.getCode());

var flow = flowList.stream().filter(item ->model.getApplyStep().equals(item.getFlowId())).collect(Collectors.toList());

// 写lambda表达式时，getXXX获取对象 不会像C#一样自动判断非空。假如改字段为空，会报错。所以用之前，先判断非空:

if(model.getApplyStep() != null ){

　　var flow = flowList.stream().filter(item ->model.getApplyStep().equals(item.getPrevFlowId())).collect(Collectors.toList());
}