Question

我正在项目android中使用此哈希图。

使用此命令：

@Configuration
@EnableKafka
public class ConsumerConfig {

    @Value("${kafka.bootstrap-servers}")
    private String bootstrapServers;

    @Value("${kafka.group-id}")
    private String groupId;

    /**
     * Configuration of Consumer properties.
     * 
     * @return
     */
    //@Bean
    public Map<String, Object> consumerConfigs() {
        Map<String, Object> props = new HashMap<>();

        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, JsonDeserializer.class);

        props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);

        return props;
    }

    //@Bean
    public ConsumerFactory<String, ClassA> consumerFactory1() {
        return new DefaultKafkaConsumerFactory<>(consumerConfigs(), new StringDeserializer(),
                new ClassA());
    }

    /**
     * Kafka Listener Container Factory.
     * @return
     */
    @Bean("kafkaListenerContainerFactory1")
    public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, ClassA>> kafkaListenerContainerFactory1() {
        ConcurrentKafkaListenerContainerFactory<String, ClassA> factory;
        factory = new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConsumerFactory(consumerFactory1());
        return factory;
    }

    //@Bean
    public ConsumerFactory<String, ClassB> consumerFactory2() {
        return new DefaultKafkaConsumerFactory<>(consumerConfigs(), new StringDeserializer(),
                new ClassB());
    }

    /**
     * Kafka Listener Container Factory.
     * @return
     */
    @Bean("kafkaListenerContainerFactory2")
    public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, ClassB>> kafkaListenerContainerFactory2() {
        ConcurrentKafkaListenerContainerFactory<String, ClassB> factory;
        factory = new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConsumerFactory(consumerFactory2());
        return factory;
    }

    @Bean
    public ReceiverClass receiver() {
        return new ReceiverClass();
    }

    class ReceiverClass {
        @KafkaListener(topics = "topic1", group = "group-id-test",
                containerFactory = "kafkaListenerContainerFactory1")
        public void receiveTopic1(ClassA a) {
            System.out.println("ReceiverClass.receive() ClassA : " + a);
        }

        @KafkaListener(topics = "topic2", group = "group-id-test",
                containerFactory = "kafkaListenerContainerFactory2")
        public void receiveTopic2(ClassB b) {
            System.out.println("ReceiverClass.receive() Classb : " + b);
        }

    }

    class ClassB  implements Deserializer  {

        @Override
        public void configure(Map configs, boolean isKey) {
            // TODO Auto-generated method stub

        }

        @Override
        public Object deserialize(String topic, byte[] data) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public void close() {
            // TODO Auto-generated method stub

        }

    }

    class ClassA  implements Deserializer {

        @Override
        public void configure(Map configs, boolean isKey) {
            // TODO Auto-generated method stub

        }

        @Override
        public Object deserialize(String topic, byte[] data) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public void close() {
            // TODO Auto-generated method stub

        }

    }
}

其中test1是：

            List<Map<Integer, Double>> peak = PeakDetect.peak_detection(test1,delta, indices);

我有这个结果：

double [] test1= {16 ,1, 2, -20, 3, 12, 2, 1, 0, -1, -2 ,-3, -6, -3, -2 ,-1, 0};

在该示例中，我希望将第一个索引存储在新数组中：

Result: [{0=0.14692041925343213, 5=0.28567859299278475}, {3=0.4244367667321373}]

0和5表示test1的最大值，3表示test1的最小值。

我该怎么做？在此先感谢

修改这是peak_detector.java：

0 and 5

Answer 1

像这样吗？

List<List<Integer>> indexes = peaks
             .stream()
             .map(p -> p.entrySet()
                     .stream()
                     .map(Map.Entry::getKey)
                     .collect(Collectors.toList()))
             .collect(Collectors.toList());

    System.out.println(indexes.get(0)); // maxima list output = [0, 5]
    System.out.println(indexes.get(1)); // minima list output = [3]

如何将List <map <integer，double =“” >>峰转换为数组？

1 个答案: