code: public String getComment() {
          synchronized (this) {
              ensureOpen();
              byte[] bcomm = getCommentBytes(jzfile);
              if (bcomm == null)
                  return null;
              return zc.toString(bcomm, bcomm.length);
          }
      }
docs: Returns the zip file comment, or null if none.
  
  @return the comment string for the zip file, or null if none
  
  @throws IllegalStateException if the zip file has been closed
  
  Since 1.7