JAVA determine whether a file exists OSS

/ ** 
* determine whether a file exists 
* @param remoteFileName 
* @return 
* 2018 Nian 11 Yue 23 Ri 
* / 
public static Boolean DoesObjectExist (String remoteFileName) { 
    // Endpoint A Case Study, other region according to the actual situation fill 
    String endpoint = ""; 
    // cloud account AccessKey have all API access, it is recommended to follow Ali cloud security best practices, create and use sub-accounts RAM API access or daily operation and maintenance, please login 
    String accessKeyId = ""; 
    String = accessKeySecret " "; 
    // create OSSClient instance 
    OSSClient ossClient = new new OSSClient (Endpoint, accessKeyId, accessKeySecret); 
    Boolean the Result = ossClient.doesObjectExist (bucketName, remoteFileName); 
    // close OSSClient. 
    ossClient.shutdown (); 
    return Result; 
}