src/java.base/share/classes/java/security/MessageDigest.java

rev 52979 : 8215281: Use String.isEmpty() when applicable in java.base
Reviewed-by: TBD

*** 235,245 ****
       */
      public static MessageDigest getInstance(String algorithm, String provider)
          throws NoSuchAlgorithmException, NoSuchProviderException
      {
          Objects.requireNonNull(algorithm, "null algorithm name");
!         if (provider == null || provider.length() == 0)
              throw new IllegalArgumentException("missing provider");
          Object[] objs = Security.getImpl(algorithm, "MessageDigest", provider);
          if (objs[0] instanceof MessageDigest) {
              MessageDigest md = (MessageDigest)objs[0];
              md.provider = (Provider)objs[1];
--- 235,245 ----
       */
      public static MessageDigest getInstance(String algorithm, String provider)
          throws NoSuchAlgorithmException, NoSuchProviderException
      {
          Objects.requireNonNull(algorithm, "null algorithm name");
!         if (provider == null || provider.isEmpty())
              throw new IllegalArgumentException("missing provider");
          Object[] objs = Security.getImpl(algorithm, "MessageDigest", provider);
          if (objs[0] instanceof MessageDigest) {
              MessageDigest md = (MessageDigest)objs[0];
              md.provider = (Provider)objs[1];