java對一個無序列表進行分組
阿新 • • 發佈：2019-02-06
對一個集合的資料進行分組
/**
* rCount : 11
* rData : [{"area_id":"1","up_area_id":"0","area_key":"000001","area_name":"龍田鎮","area_img":"","area_points":[],"childs":[{"area_id":"3","up_area_id":"1","area_key":"000003","area_name":"龍田_某某村1","area_img":"","area_points":[],"childs":[]},{"area_id":"4","up_area_id":"1" 看到資料如上我們需要做的是分成鎮資料包含村資料
//構造城鎮列表
List<TownListEntity.RDataBean> towns = new ArrayList<>();
for (TownListEntity.RDataBean town : response.body().getRData()) {
//up_area_id為0的都為城鎮列表
if (town.getUp_area_id().equals("0")) {
towns.add(town);
}
}
//遍歷上面得到的城鎮列表
for (TownListEntity.RDataBean town : towns) {
//構造鄉村列表
List<TownListEntity.RDataBean.ChildsBean> child = new ArrayList<>();
//遍歷得到的所有資料找出城鎮列表下級的所有孩子
for (TownListEntity.RDataBean country : response.body().getRData()) {
//如果up_area_id為0為城鎮不做處理繼續下一條
if (country.getUp_area_id().equals("0")) {
continue;
}
//如果鄉村的ID上一級所指為當前遍歷的城鎮 那麼新增
if (country.getUp_area_id().equals(town.getArea_id())) {
child.add(new TownListEntity.RDataBean.
ChildsBean(country.getArea_id(), country.getUp_area_id(),
country.getArea_key(), country.getArea_name(), country.getArea_img()));
}
}
//編列結束新增鄉村列表到當前的城鎮之下
town.setChilds(child);
}
//設定城鎮列表資料
townListEntity.setRData(towns);
}