在BigTable中，不同列族的两个列限定符不能具有相同的名称。每个列限定符由列族名称和列限定符名称组成，它们一起唯一标识一个列。下面是一个示例代码，演示了如何在BigTable中创建和使用列族和列限定符。

import com.google.cloud.bigtable.hbase.BigtableConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;

import java.io.IOException;

public class BigtableExample {

    private static final String PROJECT_ID = "your-project-id";
    private static final String INSTANCE_ID = "your-instance-id";
    private static final String TABLE_NAME = "your-table-name";
    private static final String FAMILY_1 = "cf1";
    private static final String FAMILY_2 = "cf2";
    private static final String QUALIFIER_1 = "col1";
    private static final String QUALIFIER_2 = "col2";

    public static void main(String[] args) throws IOException {
        // Create a connection to BigTable
        Connection connection = BigtableConfiguration.connect(PROJECT_ID, INSTANCE_ID);

        // Get a table instance
        Table table = connection.getTable(TableName.valueOf(TABLE_NAME));

        // Create a Put request and add data to columns in different families
        Put put = new Put("row-key".getBytes());
        put.addColumn(FAMILY_1.getBytes(), QUALIFIER_1.getBytes(), "value1".getBytes());
        put.addColumn(FAMILY_2.getBytes(), QUALIFIER_2.getBytes(), "value2".getBytes());
        table.put(put);

        // Create a Get request and retrieve data from columns in different families
        Get get = new Get("row-key".getBytes());
        Result result = table.get(get);
        byte[] value1 = result.getValue(FAMILY_1.getBytes(), QUALIFIER_1.getBytes());
        byte[] value2 = result.getValue(FAMILY_2.getBytes(), QUALIFIER_2.getBytes());
        System.out.println("Value1: " + new String(value1));
        System.out.println("Value2: " + new String(value2));

        // Close the table and connection
        table.close();
        connection.close();
    }
}

在上述示例中，我们创建了一个名为your-table-name的表，并定义了两个列族cf1和cf2，以及两个列限定符col1和col2。然后，我们使用Put请求将数据写入不同列族的列，并使用Get请求从不同列族的列中检索数据。

请注意，如果尝试在不同列族的两个列限定符中使用相同的名称，将会引发org.apache.hadoop.hbase.DoNotRetryIOException异常。