1.先创建数据
List<Map<String, Object>> list = new ArrayList<>();
Map<String, Object> map1 = new HashMap<>();
map1.put("name","a");
map1.put("age","3");
Map<String, Object> map2 = new HashMap<>();
map1.put("name","b");
map2.put("age","4");
Map<String, Object> map3 = new HashMap<>();
map1.put("name","c");
map3.put("age","3");
Map<String, Object> map4 = new HashMap<>();
map1.put("name","d");
map4.put("age","5");
list.add(map1);
list.add(map2);
list.add(map3);
list.add(map4);
2.使用stream流处理数据
要求:对list中age属性相同的map进行分组处理
Map<Object, List<Map<String, Object>>> ageMap = list.stream().collect(Collectors.groupingBy(item -> {
return item.get("age");
}));
3.对处理的数据进行后续操作
for (Object o : ageMap.keySet()) {
List<Map<String, Object>> maps = ageMap.get(o);
}
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