### Question:
Statistics implements Serializable { public void clearStatistics() { if (cache == null) { throw new IllegalStateException("This statistics object no longer references a Cache."); } cache.clearStatistics(); } Statistics(Ehcache cache, int statisticsAccuracy, long cacheHits, long onDiskHits, long inMemoryHits,
                      long misses, long size, float averageGetTime, long evictionCount, long memoryStoreSize,
                      long diskStoreSize); void clearStatistics(); long getCacheHits(); long getInMemoryHits(); long getOnDiskHits(); long getCacheMisses(); long getObjectCount(); long getMemoryStoreObjectCount(); long getDiskStoreObjectCount(); int getStatisticsAccuracy(); String getStatisticsAccuracyDescription(); String getAssociatedCacheName(); Ehcache getAssociatedCache(); @Override final String toString(); float getAverageGetTime(); long getEvictionCount(); static boolean isValidStatisticsAccuracy(int statisticsAccuracy); static final int STATISTICS_ACCURACY_NONE; static final int STATISTICS_ACCURACY_BEST_EFFORT; static final int STATISTICS_ACCURACY_GUARANTEED; }### Answer:
@Test public void testClearStatistics() throws InterruptedException { Cache cache = new Cache("test", 1, true, false, 5, 2); manager.addCache(cache); cache.put(new Element("key1", "value1")); cache.put(new Element("key2", "value1")); cache.get("key1"); Statistics statistics = cache.getStatistics(); assertEquals(1, statistics.getCacheHits()); assertEquals(1, statistics.getOnDiskHits()); assertEquals(0, statistics.getInMemoryHits()); assertEquals(0, statistics.getCacheMisses()); statistics.clearStatistics(); statistics = cache.getStatistics(); assertEquals(0, statistics.getCacheHits()); assertEquals(0, statistics.getOnDiskHits()); assertEquals(0, statistics.getInMemoryHits()); assertEquals(0, statistics.getCacheMisses()); }
@Test public void testClearStatistics() throws InterruptedException { Cache cache = new Cache("test", 1, true, false, 5, 2); manager.addCache(cache); cache.setStatisticsEnabled(true); cache.put(new Element("key1", "value1")); cache.put(new Element("key2", "value1")); cache.get("key1"); Statistics statistics = cache.getStatistics(); assertEquals(1, statistics.getCacheHits()); assertEquals(1, statistics.getOnDiskHits()); assertEquals(0, statistics.getInMemoryHits()); assertEquals(0, statistics.getCacheMisses()); statistics.clearStatistics(); statistics = cache.getStatistics(); assertEquals(0, statistics.getCacheHits()); assertEquals(0, statistics.getOnDiskHits()); assertEquals(0, statistics.getInMemoryHits()); assertEquals(0, statistics.getCacheMisses()); }