### Question:
WordForestUtil { public static void prefixWordEqualZero(Map<String, WordFrequency> outputList,String countWordNode , StringBuilder[] prefixWord) { prefixWord[StableData.INT_ZERO].delete(StableData.INT_ZERO, prefixWord[StableData.INT_ZERO].length()); prefixWord[StableData.INT_ZERO].append(countWordNode); if (outputList.containsKey(countWordNode)) { WordFrequency wordFrequency = outputList.get(countWordNode); wordFrequency.setFrequency(wordFrequency.getFrequency() + StableData.INT_ONE); outputList.put(countWordNode, wordFrequency); return; } WordFrequency wordFrequency = new WordFrequency(); wordFrequency.setFrequency(StableData.INT_ONE); wordFrequency.setWord(countWordNode); outputList.put(countWordNode, wordFrequency); }  static void wordsForestNotContainsKey(Map<String, WordFrequency> outputList
			, String countWordNode, StringBuilder[] prefixWord); static void prefixWordEqualZero(Map<String, WordFrequency> outputList,String countWordNode
			, StringBuilder[] prefixWord); static void wordsForestContainsKey(Map<String, WordFrequency> outputList,String countWordNode
			, StringBuilder[] prefixWord);  }### Answer:
@Test public void testPrefixWordEqualZero() { fail("Not yet implemented"); }