Google Guava Cache本地缓存怎么用？

LoadingCache<String, String> cache = CacheBuilder.newBuilder()
    .maximumSize(100)
    .expireAfterWrite(10, TimeUnit.MINUTES)
    .build(new CacheLoader<String, String>() {
        @Override
        public String load(String key) throws Exception {
            return fetchDataFromDatabase(key); // 模拟从数据库获取数据
        }
    });
String value = cache.get("key");