集合

1. 过滤、排序

List<Glbdef18VO> glbdef18VOs=Arrays.asList(lrmxVO.getGlbdef18VOs()).stream()
.filter(new Predicate<Glbdef18VO>() {
    @Override
    public boolean test(Glbdef18VO glbdef18VO) {
        if(glbdef18VO.getAttributeValue("glbdef6")==null) {
            return false;
        }
        return ((UFLiteralDate)glbdef18VO.getAttributeValue("glbdef6")).before(endDate);
    }})
.sorted(new Comparator<Glbdef18VO>() {
    @Override
    public int compare(Glbdef18VO o1, Glbdef18VO o2) {
        return ((UFLiteralDate)o1.getAttributeValue("glbdef6")).compareTo((UFLiteralDate)o2.getAttributeValue("glbdef6"));
    }})
.collect(Collectors.toList());

2. 聚合

Optional<Glbdef18VO> mergedGlbdef18VO=entry.getValue().stream().reduce(new BinaryOperator<Glbdef18VO>() {
    @Override
    public Glbdef18VO apply(Glbdef18VO o1, Glbdef18VO o2) {
        o1.setAttributeValue("glbdef10", o1.getAttributeValue("glbdef10")+";"+o2.getAttributeValue("glbdef10"));
        return o1;
    }
});
if(mergedGlbdef18VO.isPresent()) {                  
    mergedGlbdef18VOs.add(mergedGlbdef18VO.get());
}

3. 分组

Map<String,List<ScoreDetaillVO>> raterScoreDetaillVOMap=Stream.generate(scoreDetaillVOs.iterator()::next)
                .limit(scoreDetaillVOs.size())
                .collect(Collectors.groupingBy(ScoreDetaillVO::getRater));

4. List转Map

        Map<String, FillDataDetailVO> rootScoreDetailVOs = Arrays.asList(scoreDetailVOs).stream()
                .filter(new Predicate<FillDataDetailVO>() {
                    @Override
                    public boolean test(FillDataDetailVO scoreDetaillVO) {
                        return scoreDetaillVO.getIndicatorspid() == null;
                    }
                }).collect(Collectors.toMap(FillDataDetailVO::getIndicators, o -> o));