Add GetObjectChecksums.java sample

Author: nidhiii-27

samples/snippets/src/main/java/com/example/storage/object/GetObjectChecksums.java

@@ -0,0 +1,34 @@
+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 {
+  public static void getObjectChecksums(String bucketName, String objectName) throws IOException {
+    // [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");
+      return;
+    }
+
+    System.out.println("Object: " + objectName + " in bucket: " + bucketName + " has CRC32C: " + blobInfo.getCrc32c() + " and MD5: " + blobInfo.getMd5());
+    // [END storage_get_object_checksums]
+  }
+}