Java - Stream Filter 多条件筛选过滤

Java Stream���中Filter用于通过设置的条件过滤出元素 ，示例如下：

List strings = Arrays.asList(“abc”, “”, “bc”, “efg”, “abcd”,"", “jkl”);List filtered = strings.stream().filter(string -> !string.isEmpty()).collect(Collectors.toList());

如果需要进行多条件过滤

我们可以对这些参数进行处理，我们只是需要做一下判断，即：

让所有参数默认为 false，然后对传进来的值进行取值判断，若满足该条件为true，多个条件进行多次判断

判断完成之后 会拿到所有的boolean值 通过 && 拼接返回，即 有一个为false，即返回值为false

通过该方法会对一个对象进行多条件过滤

public static List checkOperationv1(List list, BidProgressEnum progressEnum){        Integer progress = Integer.valueOf(progressEnum.getCode());        String nodeId = progressEnum.getNode();        List collect = list.stream().filter(bidListVo -> filterProgress(bidListVo,progress)  )                .collect(Collectors.toList());             return collect;    }    private static boolean filterProgress(BidListVo bidListVo, Integer progress) {        //副流程未开始 只判断主流程        if(StringUtils.isEmpty(bidListVo.getReviewProgress())){            return Integer.valueOf(bidListVo.getProgress()) >= progress ? true: false;        }else if(Integer.valueOf(bidListVo.getProgress()) >= progress ||                Integer.valueOf(bidListVo.getReviewProgress()) >= progress){            // 主流程 独立流程 任意一个大于当前筛选进度就好            return true;        }        return false;    }

示例 

public class MultiFilterTest {    public static void main(String[] args) {        List userList = getUserList();        // 筛选 age > 18 && address = "上海" 的user        List filterList = userList.stream().filter(user -> filterAgeAndAddress(user,18,"上海")).collect(Collectors.toList());        filterList.forEach(System.out::println);    }    // 筛选 age > 18 && address = "上海" 的user    private static boolean filterAgeAndAddress(User user,Integer age,String address){        if(user.getAge() > 18 && address.equals(user.getAddress())){            return true;        }        return false;    }    private static List getUserList() {        List userList = new ArrayList();        userList.add(new User(1,"张三",18,"上海"));        userList.add(new User(2,"王五",16,"上海"));        userList.add(new User(3,"李四",20,"上海"));        userList.add(new User(4,"张雷",22,"北京"));        userList.add(new User(5,"张超",15,"深圳"));        userList.add(new User(6,"李雷",24,"北京"));        userList.add(new User(7,"王爷",21,"上海"));        userList.add(new User(8,"张三丰",18,"广州"));        userList.add(new User(9,"赵六",16,"广州"));        userList.add(new User(10,"赵无极",26,"深圳"));        return userList;    }}

输出如下：