在Java8中合并递归Hashmap
我需要合并多个在Java8中合并递归Hashmap,java,dictionary,java-8,hashmap,java-stream,Java,Dictionary,Java 8,Hashmap,Java Stream,我需要合并多个HashMaps 地图1: 地图2: 预期结果 {"41666": {"oyo_id":"KSD900", "contracted_rooms":31, "status":"live" }, "41667": {"oyo_id":"JGH900", "contracted_rooms":3, "status":"live" } } 我所尝试的: 分配的属性响应: @JsonProperty("oyo_id") private String oyoId; @Js
HashMap
s
地图1:
地图2:
预期结果
{"41666":
{"oyo_id":"KSD900",
"contracted_rooms":31,
"status":"live"
},
"41667":
{"oyo_id":"JGH900",
"contracted_rooms":3,
"status":"live"
}
}
我所尝试的:
分配的属性响应
:
@JsonProperty("oyo_id")
private String oyoId;
@JsonProperty("status")
private String status;
@JsonProperty("contractedRoomsCount")
private Double contracted_rooms_count;
已分配属性响应者:
HashMap<String, AssignedPropertiesResponse>
map1.putAll(map2);
HashMap
map1.putAll(map2);
但这会将map2的值覆盖到map2中。以下是一个示例性实现:
map2.forEach((key, value) -> {
AssignedPropertiesResponse r = map1.get(key);
if(r != null) r.setContracted_rooms_count(value.getContracted_rooms_count());
});
注意:变量名是用camelCase在java中编写的。创建一个合并函数
map2.merge(key, value, (v1, v2) -> new AssignedPropertiesResponse(v1.getOyoId(),v1.getStatus(),v2.getContractedRoomsCount())
然后您可以在map2上迭代,并将条目合并到map1中
map2.forEach(
(key, value) -> map1.merge(key, value, (v1, v2) -> new AssignedPropertiesResponse(v1.getOyoId(),v1.getStatus(),v2.getContractedRoomsCount())));
map2.merge(key, value, (v1, v2) -> new AssignedPropertiesResponse(v1.getOyoId(),v1.getStatus(),v2.getContractedRoomsCount())
map2.forEach(
(key, value) -> map1.merge(key, value, (v1, v2) -> new AssignedPropertiesResponse(v1.getOyoId(),v1.getStatus(),v2.getContractedRoomsCount())));