寫出一個緩存系統的偽代碼001

/*** 寫出一個緩存系統的偽代碼*/
public class CacheDemo {private Map<String, Object> map = new HashMap<String, Object>();public static void main(String[] args) {// TODO Auto-generated method stub}    public synchronized Object getData(String key){ Object value = map.get(key);if (value == null){return "aaa";//實現QueryDB()
        }return value;}
}

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