java使用hashMap缓存保存数据的方法

 private static final HashMap sCache = new HashMap(); private static int sId = -1; public static void initAlbumArtCache() { try { //。。。 if (id != sId) { clearCache(); sId = id; } } catch (RemoteException e) { e.printStackTrace(); } } public static void clearCache() { synchronized(sCache) { sCache.clear(); } } public static XXX getCachedXXX(long Index, BitmapDrawable defaultBitmap) { XXX d = null; synchronized(sCache) { d = sCache.get(Index); } if (d == null) { //。。。 synchronized(sArtCache) { // the cache may have changed since we checked XXX value = sCache.get(Index); if (value == null) { sCache.put(Index, d); } else { d = value; } } } return d; }