src/java.base/share/classes/sun/security/x509/AVA.java

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

*** 1243,1253 ****
          if (standard == AVA.DEFAULT && keyword.startsWith("OID.")) {
              keyword = keyword.substring(4);
          }
  
          boolean number = false;
!         if (keyword.length() != 0) {
              char ch = keyword.charAt(0);
              if ((ch >= '0') && (ch <= '9')) {
                  number = true;
              }
          }
--- 1243,1253 ----
          if (standard == AVA.DEFAULT && keyword.startsWith("OID.")) {
              keyword = keyword.substring(4);
          }
  
          boolean number = false;
!         if (!keyword.isEmpty()) {
              char ch = keyword.charAt(0);
              if ((ch >= '0') && (ch <= '9')) {
                  number = true;
              }
          }
*** 1283,1293 ****
              AVAKeyword ak = oidMap.get(oid);
              if ((ak != null) && ak.isCompliant(standard)) {
                  return ak.keyword;
              }
          } else {
!             if (keywordString.length() == 0) {
                  throw new IllegalArgumentException("keyword cannot be empty");
              }
              keywordString = keywordString.trim();
              char c = keywordString.charAt(0);
              if (c < 65 || c > 122 || (c > 90 && c < 97)) {
--- 1283,1293 ----
              AVAKeyword ak = oidMap.get(oid);
              if ((ak != null) && ak.isCompliant(standard)) {
                  return ak.keyword;
              }
          } else {
!             if (keywordString.isEmpty()) {
                  throw new IllegalArgumentException("keyword cannot be empty");
              }
              keywordString = keywordString.trim();
              char c = keywordString.charAt(0);
              if (c < 65 || c > 122 || (c > 90 && c < 97)) {