Java methods for saving data using the HashMap cache _java

The example in this article describes how Java uses the HashMap cache to save data. Share to everyone for your reference, specific as follows:

Private static final Hashmap<long, xxx> scache = new Hashmap<long, xxx> ();
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;
}

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