有如下数据
我想对该数据进行分组(按camp阵营进行分组)
但是我不知道该怎么写,求大神指教
package com.renguanyu.demo.lambda;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class Data {
public static List<Map<String,Object>> getSanGuoMaps(){
List<Map<String,Object>> maps = new ArrayList<>();
Map<String,Object> map1 = new HashMap<>();
map1.put("id", 1);
map1.put("name", "刘备");
map1.put("height", 175.01);
map1.put("camp", "蜀");
Map<String,Object> map2 = new HashMap<>();
map2.put("id", 2);
map2.put("name", "关羽");
map2.put("height", 180.00);
map2.put("camp", "蜀");
Map<String,Object> map3 = new HashMap<>();
map3.put("id", 3);
map3.put("name", "张飞");
map3.put("height", 190.00);
map3.put("camp", "蜀");
Map<String,Object> map4 = new HashMap<>();
map4.put("id", 4);
map4.put("name", "吕布");
map4.put("height", 190.00);
map4.put("camp", "其他");
maps.add(map1);
maps.add(map2);
maps.add(map3);
maps.add(map4);
return maps;
}
}
package com.renguanyu.demo.lambda;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
public class Demo1 {
public static void main(String[] args) {
List<Map<String, Object>> sanGuoMaps = Data.getSanGuoMaps();
System.out.println(sanGuoMaps);
// sanGuoMaps.stream().collect(Collectors.groupingBy(Map::get("name")));
}
}