英文:
How to sort an objects list based on the attribute in the lists
问题
我有一个对象列表，类似于 Notification，其中包含 3 个列表 - areaWise、sensorWise 和 regionWise。我需要根据合并这 3 个列表后的最大百分比对 Notification 对象列表进行排序。
以下是我的通知对象：
{
"notificationId": 26,
"areaWise": [],
"sensorWise": [
{
"id": 3,
"threshold": 1,
"headCount": 113,
"pecentage": 11200
},
{
"id": 4,
"threshold": 1,
"headCount": 108,
"pecentage": 10700
},
{
"id": 5,
"threshold": 1,
"headCount": 108,
"pecentage": 10700
},
{
"id": 7,
"threshold": 1,
"headCount": 91,
"pecentage": 9000
}
],
"regionWise": []
}
英文:
I have an list of objects like Notification that has 3 lists - areaWise, sensorWise and regionWise. I need to sort the Notification object list based on the max percentage by combining all 3 lists.
Below is my notification object :
{
"notificationId": 26,
"areaWise": [],
"sensorWise": [
{
"id": 3,
"threshold": 1,
"headCount": 113,
"pecentage": 11200
},
{
"id": 4,
"threshold": 1,
"headCount": 108,
"pecentage": 10700
},
{
"id": 5,
"threshold": 1,
"headCount": 108,
"pecentage": 10700
},
{
"id": 7,
"threshold": 1,
"headCount": 91,
"pecentage": 9000
}
],
"regionWise": []
},
答案1
得分: 2
@Data
public class Item {
private int notificationId;
private List<Wise> areaWise;
private List<Wise> sensorWise;
private List<Wise> regionWise;
@Data
public static class Wise {
private int id;
private int threshold;
private int headCount;
private int percentage;
}
}
class Test {
static void main() {
ArrayList<Item> items = new ArrayList<>(10);
items.sort(Comparator.comparingInt(
item ->
Stream.of(item.getAreaWise(), item.getSensorWise(), item.getRegionWise())
.flatMapToInt(wises -> wises.stream().mapToInt(Item.Wise::getPercentage))
.max().orElse(Integer.MIN_VALUE)
));
}
}
英文:
@Data
public class Item {
private int notificationId;
private List<Wise> areaWise;
private List<Wise> sensorWise;
private List<Wise> regionWise;
@Data
public static class Wise {
private int id;
private int threshold;
private int headCount;
private int pecentage;
}
}
class Test {
static void main() {
ArrayList<Item> items = new ArrayList<>(10);
items.sort(Comparator.comparingInt(
item ->
Stream.of(item.getAreaWise(), item.getSensorWise(), item.getRegionWise())
.flatMapToInt(wises -> wises.stream().mapToInt(Item.Wise::getPecentage))
.max().orElse(Integer.MIN_VALUE)
));
}
}
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