public void setDBSubnetGroup(DBSubnetGroup dBSubnetGroup) {
        this.dBSubnetGroup = dBSubnetGroup;
    }
<p>
Information about the subnet group associated with the DB instance, including the name, description, and subnets
in the subnet group.
</p>

@param dBSubnetGroup
       Information about the subnet group associated with the DB instance, including the name, description, and
       subnets in the subnet group.
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/DBInstance.java