Method isBlank

src/main/java/org/htmlunit/util/StringUtils.java:107–123

Tests if a CharSequence is null, empty, or contains only whitespace. @param s the CharSequence to check @return true if a CharSequence is null, empty, or contains only whitespace

(final CharSequence s)

     * @return true if a CharSequence is null, empty, or contains only whitespace
     */
    public static boolean isBlank(final CharSequence s) {
        if (s == null) {
            return true;
        }

        final int length = s.length();
        if (length == 0) {
            return true;
        }

        for (int i = 0; i < length; i++) {
            if (!Character.isWhitespace(s.charAt(i))) {
                return false;
            }
        }
        return true;
    }

    /**
     * Tests if a CharSequence is NOT null, empty, or contains only whitespace.