stream流将集合转换为树形
public static void main(String[] args) {
{
List<Platform> platformList = Lists.newArrayList();
Platform platform0 = new Platform(1L,"001",0L,"集团");
Platform platform1 = new Platform(2L,"QYPT001",1L,"销委会");
Platform platform2 = new Platform(3L,"QYPT002",2L,"吉龙大区");
Platform platform3 = new Platform(4L,"QYPT003",2L,"江苏大区");
Platform platform4 = new Platform(5L,"QYPT004",4L,"南京分区");
Platform platform5 = new Platform(6L,"QYPT005",1L,"教育BG");
Platform platform6 = new Platform(7L,"QYPT006",6L,"华南大区");
Platform platform7 = new Platform(8L,"QYPT007",6L,"华东大区");
platformList.add(platform0);
platformList.add(platform1);
platformList.add(platform2);
platformList.add(platform3);
platformList.add(platform4);
platformList.add(platform5);
platformList.add(platform6);
platformList.add(platform7);
Map<Long, List<Platform>> groupMap = platformList.stream().collect(Collectors.groupingBy(Platform::getParentId));
platformList.forEach(platform -> platform.setChildren(groupMap.get(platform.getId())));
List<Platform> collect = platformList.stream()
.filter(platform -> platform.getParentId().equals(0L)).collect(Collectors.toList());
System.out.println(JSONObject.toJSON(collect));
}
}
stream流将集合转换为树形
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转载自blog.csdn.net/u013008898/article/details/120245473
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