java8-convert-list-to-map

@Data
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder(value = {
    "uid",
    "name",
    "age",
    "gender"
})
public class Customer {
    // creativeId equals adId
    @JsonProperty("uid")
    private String uid;
    @JsonProperty("name")
    private String name;
    @JsonProperty("age")
    private Integer age;
    @JsonProperty("gender")
    private String gender;
}

@Test
public void test() throws IOException {
    List<Customer> customerList =
        objectMapper.readValue(json, new TypeReference>() {});

    Map customerMap = customerList.stream()
        .collect(Collectors.toMap(
            Customer::getUid,       // key
            customer -> customer)); // value

    System.out.println(objectMapper.writeValueAsString(customerMap));
}