问java sdk demo如何跑通？

try{
    String SecretId = "***";
    String SecretKey = "***";

    Credential cred = new Credential(SecretId, SecretKey);

    HttpProfile httpProfile = new HttpProfile();
    httpProfile.setEndpoint("cvm.tencentcloudapi.com");

    ClientProfile clientProfile = new ClientProfile();
    clientProfile.setHttpProfile(httpProfile);

    CvmClient client = new CvmClient(cred, "ap-seoul", clientProfile);

    DescribeZonesRequest req = new DescribeZonesRequest();


    DescribeZonesResponse resp = client.DescribeZones(req);

    System.out.println(DescribeZonesResponse.toJsonString(resp));
} catch (TencentCloudSDKException e) {
    System.out.println(e.toString());
}