code: @Deprecated
      public static int compose(char[] source,char[] target, boolean compat, int options) {
          return compose(source, 0, source.length, target, 0, target.length, compat, options);
      }
docs: Compose a string.
  The string will be composed to according to the specified mode.
  @param source The char array to compose.
  @param target A char buffer to receive the normalized text.
  @param compat If true the char array will be composed according to
  NFKC rules and if false will be composed according to
  NFC rules.
  @param options The normalization options, ORed together (0 for no options).
  @return int   The total buffer size needed;if greater than length of
  result, the output was truncated.
  @exception IndexOutOfBoundsException if target.length is less than the
  required length
  @deprecated ICU 56 Use {@link Normalizer2} instead.
  @hide original deprecated declaration