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Add GetObjectChecksums.java sample #10221

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34 changes: 34 additions & 0 deletions samples/snippets/src/main/java/com/example/storage/object/GetObjectChecksums.java
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package com.example.storage.object;

import com.google.cloud.storage.BlobId;
import com.google.cloud.storage.BlobInfo;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.Storage.ChecksumRequestParams;
import com.google.cloud.storage.StorageOptions;
import java.io.IOException;

public class GetObjectChecksums {
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@gemini-code-assist gemini-code-assist bot Jan 13, 2026

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medium

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 {

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

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) {

// [START storage_get_object_checksums]
// The ID of your GCS bucket
// String bucketName = "your-bucket-name";
// The ID of your GCS object
// String objectName = "your-object-name";

Storage storage = StorageOptions.getDefaultInstance().getService();

ChecksumRequestParams checksumRequestParams =
Storage.ChecksumRequestParams.newBuilder().setChecksumAlgorithm(Storage.ChecksumAlgorithm.CRC32C, Storage.ChecksumAlgorithm.MD5).build();

BlobInfo blobInfo =
storage.get(BlobId.of(bucketName, objectName), Storage.BlobGetOption.checksumRequestParams(checksumRequestParams));

if (blobInfo == null) {
System.out.println("\nThere is no such object!\n");
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medium

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!");

return;
}

System.out.println("Object: " + objectName + " in bucket: " + bucketName + " has CRC32C: " + blobInfo.getCrc32c() + " and MD5: " + blobInfo.getMd5());
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medium

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());

// [END storage_get_object_checksums]
}
}