具有LinkedHashMap＆hellip的多维字节数组;有没有更好的办法？

// Retrieve Data From LinkedHashMap  
byte grid[][][] = null;  
if(file.exists())
{  
    if (!cache.containsKey(file))  
    {
        FileInputStream fis = new FileInputStream(file);
        BufferedInputStream bis = new BufferedInputStream(fis, 16384);
        ObjectInputStream ois = new ObjectInputStream(bis);
        cache.put(file, ois.readObject());
        ois.close();
    }
    grid = (byte[][][]) cache.get(file);
} else {
    grid = new byte[8][8][];
}

ByteArrayOutputStream baos = new ByteArrayOutputStream();
GZIPOutputStream gos = new GZIPOutputStream(baos){{    def.setLevel(2);}};
BufferedOutputStream bos = new BufferedOutputStream(gos, 16384);
DataOutputStream dos = new DataOutputStream(bos);
// Some code writes to dos
dos.close();
byte[cx][cz] = baos.toByteArray();
baos.close();
cache.put(file, grid);

private static LinkedHashMap<File, Object> cache = new LinkedHashMap<File, Object>(64, 1.1f, true)
{protected boolean removeEldestEntry(Map.Entry<File, Object> eldest) 
    {
        return size() > 64;
    }
}