### Question:
TextUtils { public static String joinPMMLDelimitedNumbers(Iterable<? extends Number> elements) { CSVFormat format = formatForDelimiter(' ').withQuoteMode(QuoteMode.NONE); return doJoinDelimited(elements, format); } private  TextUtils(); static String[] parseDelimited(String delimited, char delimiter); static String[] parsePMMLDelimited(String delimited); static String joinDelimited(Iterable<?> elements, char delimiter); static String joinPMMLDelimited(Iterable<?> elements); static String joinPMMLDelimitedNumbers(Iterable<? extends Number> elements); static String[] parseJSONArray(String json); static String joinJSON(Iterable<?> elements); static T readJSON(String json, Class<T> clazz); static T convertViaJSON(Object value, Class<T> clazz);  }### Answer:
@Test public void testJoinPMMLDelimitedNumbers() { assertEquals("-1.0 2.01 3.5", TextUtils.joinPMMLDelimitedNumbers(Arrays.asList(-1.0, 2.01, 3.5))); }