Strings { public static boolean isBlank(@Nullable String text) { return text == null || text.isBlank(); }  static byte[] bytes(String text); static String format(String pattern, Object... params); static int compare(@Nullable String text1, @Nullable String text2); static boolean isBlank(@Nullable String text); static boolean equals(@Nullable String text1, @Nullable String text2); @Nullable static String truncate(@Nullable String text, int maxLength); @Nullable static String strip(@Nullable String text); static boolean startsWith(String text, char prefix); static String[] split(String text, char delimiter);  }
@Test void isBlank() { assertThat(Strings.isBlank("")).isTrue(); assertThat(Strings.isBlank(" ")).isTrue(); assertThat(Strings.isBlank("1")).isFalse(); assertThat(Strings.isBlank(" 1")).isFalse(); }