static final String ENDPOINT = ""
static final String AK = "";
static final String SK = "";

SubnetClientConfiguration config = new SubnetClientConfiguration();
config.setCredentials(new DefaultBceCredentials(AK, SK));
config.setEndpoint(ENDPOINT);
SubnetClient subnetClient = new SubnetClient(config);

/**
 *
 * @param name   The name of subnet that will be created.
 * @param vpcId  The id of vpc which this subnet belong.
 * @param cidr   The CIDR of this subnet.
 * @param zoneName
 *        the name of available zone which the subnet belong
 *        through listZones, we can get all available zone info at current region
 *        ee.g. "cn-gz-a"  "cn-gz-b"
 * @return
 */
public CreateSubnetResponse createSubnet(String name, String vpcId, String cidr, String zoneName) {
    ......
}

/**
 * Create a subnet with the specified options.
 * You must fill the field of clientToken,which is especially for keeping idempotent.
 *
 * @param request The request containing all options for creating subnet.
 * @return List of subnetId newly created
 * @throws BceClientException
 */
public CreateSubnetResponse createSubnet(CreateSubnetRequest request)
    throws BceClientException {
    ......
}

subnetClient.createSubnet("test_subnet_2", "vpc-e8ff5i875svs", "192.168.0.0/20", "cn-bj-a");

/**
 * Return a list of subnets owned by the authenticated user.
 *
 * @return The response containing a list of subnets owned by the authenticated user.
 */
public ListSubnetsResponse listSubnets() {
    ......
}

/**
 * Return a list of subnet owned by the authenticated user.
 *
 * @param request The request containing all options for listing own's subnet.
 * @return The response containing a list of subnets owned by the authenticated user.
 */
public ListSubnetsResponse listSubnets(ListSubnetsRequest request) {
    ......
}

subnetClient.listSubnets();

 /**
     * Get the detail information of specified subnet.
     *
     * @param subnetId The id of the subnet.
     * @return A subnet detail model for the subnetId.
     */
public GetSubnetResponse getSubnet(String subnetId) {

/**
     * Get the detail information of specified subnet.
     *
     * @param getSubnetRequest The request containing all options for getting the subnet info.
     * @return A subnet detail model for the subnetId.
     */
public GetSubnetResponse getSubnet(GetSubnetRequest getSubnetRequest) {

subnetClient.getSubnet("sbn-kvrxdch0rwaf");

/**
 * Modifying the special attribute to new value of the subnet owned by the user.
 * @param subnetId The id of the subnet
 * @param name The name of the subnet after modifying
 */
public void modifySubnetAttributes(String subnetId, String name) {
    ......
}

/**
 * Modifying the special attribute to new value of the subnet owned by the user.
 *
 * @param modifySubnetAttributesRequest The request containing all options for modifying own's subnet.
 */
public void modifySubnetAttributes(ModifySubnetAttributesRequest modifySubnetAttributesRequest) {
    ......
}

subnetClient.modifySubnetAttributes("sbn-eg6ixcdpa3j2", "subnet_modify");

/**
 * Delete the specified subnet owned by the user.
 *
 * @param subnetId The id of the subnet to delete.
 */
public void deleteSubnet(String subnetId) {
    ......
}

/**
 * Delete the specified subnet owned by the user.
 *
 * @param deleteSubnetRequest the request containing all options for deleting own's subnet.
 */
public void deleteSubnet(DeleteSubnetRequest deleteSubnetRequest) {
    ......
}

subnetClient.deleteSubnet("sbn-kvrxdch0rwaf");