public class KafkaConsumer <K,V> implements Consumer <K,V> {
    public KafkaConsumer (Properties properties) { ... }

    // Statically assigned topics and partitions.
    public void assign (Collection <TopicPartition> partitions) { ... }
    public Set <TopicPartition> assignment () { ... }

    // Specific topics with dynamically assigned partitions.
    public void subscribe (Collection <String> topics) { ... }
    public void subscribe (Collection <String> topics, ConsumerRebalanceListener listener) { ... }

    // Regular expression topics with dynamically assigned partitions.
    public void subscribe (Pattern pattern) { ... }
    public void subscribe (Pattern pattern, ConsumerRebalanceListener listener) { ... }

    public void unsubscribe() { ... }
    public Set <String> subscription () { ... }

    // Poll for records.
    public ConsumerRecords <K,V> poll (final Duration timeout) { ... }

    // Seek and query position in topic partitions.
    public void seek (TopicPartition partition, long offset) { ... }
    public void seek (TopicPartition partition, OffsetAndMetadata offsetAndMetadata) { ... }
    public void seekToEnd (Collection <TopicPartition> partitions) { ... }
    public void seekToBeginning (Collection <TopicPartition> partitions) { ... }

    public long position (TopicPartition partition) { ... }
    public long position (TopicPartition partition, final Duration timeout) { ... }

    // Set and query committed position in topic partitions.
    public void commitSync () { ... }
    public void commitSync (Duration timeout) { ... }
    public void commitSync (final Map <TopicPartition, OffsetAndMetadata> offsets) { ... }
    public void commitSync (final Map <TopicPartition, OffsetAndMetadata> offsets, final Duration timeout) { ... }
    public void commitAsync () { ... }
    public void commitAsync (OffsetCommitCallback callback) { ... }

    public OffsetAndMetadata committed (TopicPartition partition) { ... }
    public OffsetAndMetadata committed (TopicPartition partition, final Duration timeout) { ... }

    public void pause (Collection<TopicPartition> partitions) { ... }
    public void resume (Collection<TopicPartition> partitions) { ... }
    public void close () { ... }

    // Introspection.
    public Map <String, List <PartitionInfo>> listTopics () { ... }
    public List <PartitionInfo> partitionsFor (String topic) { ... }

    ...
}

public class ConsumerRecord <K,V> {
    public String topic () { ... }
    public int partition () { ... }
    public long offset () { ... }
    public long timestamp () { ... }

    public K key () { ... }
    public V value () { ... }
    public Headers headers () { ... }

    public int serializedKeySize () { ... }
    public int serializedValueSize () { ... }

    ...
}