add comments

neozwu · neozwu · commit de224fbf3a97 · 2017-04-20T15:03:36.000-07:00
diff --git a/google-cloud-core/src/main/java/com/google/cloud/ServiceOptions.java b/google-cloud-core/src/main/java/com/google/cloud/ServiceOptions.java
@@ -19,7 +19,6 @@
 import static com.google.common.base.MoreObjects.firstNonNull;
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
-import static java.nio.charset.StandardCharsets.UTF_8;
 
 import com.google.api.core.ApiClock;
 import com.google.api.core.CurrentMillisClock;
@@ -37,12 +36,9 @@
 import java.io.FileReader;
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.InputStreamReader;
 import java.io.ObjectInputStream;
 import java.io.Serializable;
 import java.lang.reflect.Method;
-import java.net.HttpURLConnection;
-import java.net.URL;
 import java.nio.charset.Charset;
 import java.util.Locale;
 import java.util.Objects;
@@ -461,6 +457,10 @@ public Credentials getCredentials() {
     return credentials;
   }
 
+  /**
+   * Returns whether the credential is {@code NoCredentials} instance
+   * @return true if credential is a {@code NoCredentials} instance, false if not
+   */
   public boolean credentialIsNoCredentialInstance() {
     if (credentials != null) {
       return credentials.equals(NoCredentials.getInstance());
