docs(samples): remove client initialization as the snippets are not used standalone (#1768)

Author: Sita04

samples/snippets/src/main/java/com/example/bigtable/HelloWorld.java

@@ -59,8 +59,6 @@ public class HelloWorld {
  private static final String COLUMN_QUALIFIER_GREETING = "greeting";
  private static final String COLUMN_QUALIFIER_NAME = "name";
  private static final String ROW_KEY_PREFIX = "rowKey";
- private final String projectId;
- private final String instanceId;
  private final String tableId;
  private final BigtableDataClient dataClient;
  private final BigtableTableAdminClient adminClient;
@@ -80,8 +78,6 @@ public static void main(String[] args) throws Exception {
 
  public HelloWorld(String projectId, String instanceId, String tableId) throws IOException {
  this.tableId = tableId;
- this.projectId = projectId;
- this.instanceId = instanceId;
 
  // [START bigtable_hw_connect]
  // Creates the settings to configure a bigtable data client.
@@ -109,7 +105,7 @@ public void run() throws Exception {
  readSingleRow();
  readSpecificCells();
  readTable();
- filterLimitCellsPerCol(this.projectId, this.instanceId, tableId);
+ filterLimitCellsPerCol(tableId);
  deleteTable();
  close();
  }
@@ -221,48 +217,32 @@ public List<Row> readTable() {
  }
 
  // [START bigtable_hw_create_filter]
- public static void filterLimitCellsPerCol(String projectId, String instanceId, String tableId) {
+ public void filterLimitCellsPerCol(String tableId) {
  // A filter that matches only the most recent cell within each column
  Filter filter = FILTERS.limit().cellsPerColumn(1);
- readRowFilter(projectId, instanceId, tableId, filter);
- readFilter(projectId, instanceId, tableId, filter);
+ readRowFilter(tableId, filter);
+ readFilter(tableId, filter);
  }
  // [END bigtable_hw_create_filter]
 
  // [START bigtable_hw_get_with_filter]
- private static void readRowFilter(
- String projectId, String instanceId, String tableId, Filter filter) {
- // Initialize client that will be used to send requests. This client only needs to be created
- // once, and can be reused for multiple requests.
- try (BigtableDataClient dataClient = BigtableDataClient.create(projectId, instanceId)) {
- String rowKey =
- Base64.getEncoder().encodeToString("greeting0".getBytes(StandardCharsets.UTF_8));
- Row row = dataClient.readRow(tableId, rowKey, filter);
- printRow(row);
- System.out.println("Row filter completed.");
- } catch (IOException e) {
- System.out.println(
- "Unable to initialize service client, as a network error occurred: \n" + e);
- }
+ private void readRowFilter(String tableId, Filter filter) {
+ String rowKey =
+ Base64.getEncoder().encodeToString("greeting0".getBytes(StandardCharsets.UTF_8));
+ Row row = dataClient.readRow(tableId, rowKey, filter);
+ printRow(row);
+ System.out.println("Row filter completed.");
  }
  // [END bigtable_hw_get_with_filter]
 
  // [START bigtable_hw_scan_with_filter]
- private static void readFilter(
- String projectId, String instanceId, String tableId, Filter filter) {
- // Initialize client that will be used to send requests. This client only needs to be created
- // once, and can be reused for multiple requests.
- try (BigtableDataClient dataClient = BigtableDataClient.create(projectId, instanceId)) {
- Query query = Query.create(tableId).filter(filter);
- ServerStream<Row> rows = dataClient.readRows(query);
- for (Row row : rows) {
- printRow(row);
- }
- System.out.println("Table filter completed.");
- } catch (IOException e) {
- System.out.println(
- "Unable to initialize service client, as a network error occurred: \n" + e);
+ private void readFilter(String tableId, Filter filter) {
+ Query query = Query.create(tableId).filter(filter);
+ ServerStream<Row> rows = dataClient.readRows(query);
+ for (Row row : rows) {
+ printRow(row);
  }
+ System.out.println("Table filter completed.");
  }
  // [END bigtable_hw_scan_with_filter]