public boolean isBlank(final CharSequence cs){
  int strLen;
  if (cs == null || (strLen=cs.length()) == 0) {
    return true;
  }
  for (int i=0; i < strLen; i++) {
    if (!Character.isWhitespace(cs.charAt(i))) {
      return false;
    }
  }
  return true;
}

public boolean isBlank ( final CharSequence cs ) { int strLen ; if ( cs == null || ( strLen = cs . length ( ) ) == 0 ) { return true ; } for ( int i = 0 ; i < strLen ; i ++ ) { if ( ! Character . isWhitespace ( cs . charAt ( i ) ) ) { return false ; } } return true ; }
checks if a charsequence is whitespace , empty ( " " ) or null .
