Add GetObjectChecksums.java sample

[nidhiii-27]

This PR adds the GetObjectChecksums.java sample to demonstrate how to use the new getObjectChecksums method to retrieve the CRC32C and MD5 checksums of a Google Cloud Storage object.

[snippet-bot]

Here is the summary of changes.

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• samples/snippets/src/main/java/com/example/storage/object/GetObjectChecksums.java:12, tag storage_get_object_checksums

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[gemini-code-assist]

Summary of Changes

Hello @nidhiii-27, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request adds a new Java sample that demonstrates how to programmatically retrieve CRC32C and MD5 checksums for objects stored in Google Cloud Storage. The sample utilizes the getObjectChecksums method and ChecksumRequestParams to provide a clear example of verifying data integrity by fetching these crucial metadata fields.

Highlights

• New Sample Added: A new Java sample, GetObjectChecksums.java, has been introduced to demonstrate how to retrieve object checksums from Google Cloud Storage.
• Checksum Retrieval: The sample specifically illustrates the use of the getObjectChecksums method to fetch CRC32C and MD5 checksums for a given GCS object.
• Usage of ChecksumRequestParams: It showcases how to construct and apply Storage.ChecksumRequestParams to specify the desired checksum algorithms (CRC32C and MD5) when making a get request for a blob.

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[gemini-code-assist]

Code Review

This pull request adds a new Java sample GetObjectChecksums.java to demonstrate fetching object checksums from Google Cloud Storage. The code is functionally correct, but I have a few suggestions to improve its adherence to Java best practices, such as making the utility class final, adding a private constructor, using more appropriate string formatting, and refining method signatures and output messages. These changes will improve the code's maintainability and readability.

[gemini-code-assist]

Since this class only contains static methods, it should be marked as final to prevent it from being subclassed. It's also a good practice to add a private constructor to prevent instantiation. You can add private GetObjectChecksums() {} inside the class.

Suggested change

	public class GetObjectChecksums {
	public final class GetObjectChecksums {

[gemini-code-assist]

The throws IOException clause is unnecessary. The storage.get() method throws StorageException, which is a RuntimeException and does not need to be declared in the method signature. Removing it makes the signature more accurate.

Suggested change

	public static void getObjectChecksums(String bucketName, String objectName) throws IOException {
	public static void getObjectChecksums(String bucketName, String objectName) {

[gemini-code-assist]

The System.out.println() method already adds a newline character at the end of the output, so the trailing \n is redundant.

Suggested change

	System.out.println("\nThere is no such object!\n");
	System.out.println("\nThere is no such object!");

[gemini-code-assist]

Using System.out.printf() can make this line more readable and is generally preferred over string concatenation, especially with multiple variables.

Suggested change

	System.out.println("Object: " + objectName + " in bucket: " + bucketName + " has CRC32C: " + blobInfo.getCrc32c() + " and MD5: " + blobInfo.getMd5());
	System.out.printf("Object: %s in bucket: %s has CRC32C: %s and MD5: %s%n", objectName, bucketName, blobInfo.getCrc32c(), blobInfo.getMd5());