String bucket = "examplebucket-1250000000"; // Bucket name. Format: BucketName-APPID
String cosPath = "exampleobject"; // The location identifier of the object in the bucket, i.e., the object key.

DeleteObjectRequest deleteObjectRequest = new DeleteObjectRequest(bucket,
        cosPath);
cosXmlService.deleteObjectAsync(deleteObjectRequest,
        new CosXmlResultListener() {
    @Override
    public void onSuccess(CosXmlRequest cosXmlRequest, CosXmlResult result) {
        DeleteObjectResult deleteObjectResult = (DeleteObjectResult) result;
    }

    // If you call the API using kotlin, note that the exception in the callback method must be nullable. Otherwise, the onFail method will not be called, as follows:
    // The type of clientException is CosXmlClientException?, and the type of serviceException is CosXmlServiceException?
    @Override
    public void onFail(CosXmlRequest cosXmlRequest,
                       @Nullable CosXmlClientException clientException,
                       @Nullable CosXmlServiceException serviceException) {
        if (clientException != null) {
            clientException.printStackTrace();
        } else {
            serviceException.printStackTrace();
        }
    }
});

// A bucket name consists of bucketname-appid. The appid must be included. You can view bucket names in the COS console. https://console.tencentcloud.com/cos5/bucket
String bucket = "examplebucket-1250000000";
List<String> objectList = new ArrayList<String>();
objectList.add("exampleobject1"); // The location identifier of the object in the bucket, i.e., the object key.
objectList.add("exampleobject2"); // The location identifier of the object in the bucket, i.e., the object key.

DeleteMultiObjectRequest deleteMultiObjectRequest =
        new DeleteMultiObjectRequest(bucket, objectList);
// In Quiet mode, only information about objects that encountered errors is returned. Otherwise, the deletion result for each Object is returned.
deleteMultiObjectRequest.setQuiet(true);
cosXmlService.deleteMultiObjectAsync(deleteMultiObjectRequest,
        new CosXmlResultListener() {
    @Override
    public void onSuccess(CosXmlRequest cosXmlRequest, CosXmlResult result) {
        DeleteMultiObjectResult deleteMultiObjectResult =
                (DeleteMultiObjectResult) result;
    }

    // If you call the API using kotlin, note that the exception in the callback method must be nullable. Otherwise, the onFail method will not be called, as follows:
    // The type of clientException is CosXmlClientException?, and the type of serviceException is CosXmlServiceException?
    @Override
    public void onFail(CosXmlRequest cosXmlRequest,
                       @Nullable CosXmlClientException clientException,
                       @Nullable CosXmlServiceException serviceException) {
        if (clientException != null) {
            clientException.printStackTrace();
        } else {
            serviceException.printStackTrace();
        }
    }
});

// A bucket name consists of bucketname-appid. The appid must be included. You can view bucket names in the COS console. https://console.tencentcloud.com/cos5/bucket
String bucket = "examplebucket-1250000000";
String prefix = "folder1/"; // Specify the prefix.

GetBucketRequest getBucketRequest = new GetBucketRequest(bucket);
// prefix indicates the folder to be deleted.
getBucketRequest.setPrefix(prefix);
// Set the maximum number of objects to be traversed, and the maximum number of objects supported by a listobject is 1,000.
getBucketRequest.setMaxKeys(1000);
GetBucketResult getBucketResult = null;

do {
    try {
        getBucketResult = cosXmlService.getBucket(getBucketRequest);
        List<ListBucket.Contents> contents = getBucketResult.listBucket.contentsList;
        DeleteMultiObjectRequest deleteMultiObjectRequest = new DeleteMultiObjectRequest(bucket);
        for (ListBucket.Contents content : contents) {
            deleteMultiObjectRequest.setObjectList(content.key);
        }
        cosXmlService.deleteMultiObject(deleteMultiObjectRequest);
        getBucketRequest.setMarker(getBucketResult.listBucket.nextMarker);
    } catch (CosXmlClientException e) {
        e.printStackTrace();
        return;
    } catch (CosXmlServiceException e) {
        e.printStackTrace();
        return;
    }
} while (getBucketResult.listBucket.isTruncated);