public abstract class AdminClient implements AutoCloseable {
 	
	public abstract DescribeConsumerGroupsResult describeConsumerGroups(Collection<String> groupIds, DescribeConsumerGroupsOptions options);
 
	public DescribeConsumerGroupsResult describeConsumerGroups(Collection<String> groupIds) {
    	return describeConsumerGroups(groupIds, new DescribeConsumerGroupsOptions());
	}
 
    public abstract ListConsumerGroupsResult listConsumerGroups(ListConsumerGroupsOptions options);

    public ListConsumerGroupsResult listConsumerGroups() {
        return listConsumerGroups(new ListConsumerGroupsOptions());
    }

    public ListConsumerGroupOffsetsResult listConsumerGroupOffsets(String groupId, ListConsumerGroupsOptions options);
 
    public ListConsumerGroupOffsetsResult listConsumerGroupOffsets(String groupId) {
        return listConsumerGroupOffsets(new ListConsumerGroupOffsetsOptions());
    }
 
    public DeleteConsumerGroupsResult deleteConsumerGroups(Collection<String> groupIds, DeleteConsumerGroupsOptions options);
 
    public DeleteConsumerGroupsResult deleteConsumerGroups(Collection<String> groupIds) {
        return deleteConsumerGroups(groupIds, new DeleteConsumerGroupsOptions());
    }
}
 
public class DescribeConsumerGroupOptions extends AbstractOptions<DescribeConsumerGroupOptions> {
}
 
public class DescribeConsumerGroupResult {
    private final Map<String, KafkaFuture<ConsumerGroupDescription>> futures;
...
}
 
public class ConsumerGroupDescription {
    private final String groupId;
    private final boolean isSimpleConsumerGroup;
    private final List<MemberDescription> members;
    private final String partitionAssignor;
}
 
public class MemberDescription {
    private final String consumerId;
    private final String clientId;
    private final String host;
    private final MemberAssignment assignment;
}
 
public class MemberAssignment {
    private final List<TopicPartition> topicPartitions;
}

public class ListConsumerGroupsOptions extends AbstractOptions<ListConsumerGroupsOptions> {
}

public class ListConsumerGroupsResult {
    final KafkaFuture<Map<String, GroupListing>> future;

    //...
}
 
public class ConsumerGroupListing {
    private final boolean isSimpleConsumerGroup;
}
 
public class ListConsumerGroupOffsetsOptions extends AbstractOptions<ListConsumerGroupsOptions> {
}
 
public class ListConsumerGroupOffsetsResult {
    final KafkaFuture<Map<TopicPartition, OffsetAndMetadata>> future;
 
    //...
}
 
public class DeleteConsumerGroupOptions extends AbstractOptions<DeleteConsumerGroupOptions> {
}
 
public class DeleteConsumerGroupsResult {
    final Map<String, KafkaFuture<Void>> future;
}