[Android 픽업]Java 방법 반환 값 유형 약화

    /**
     * Returns the value associated with the given key, or null if
     * no mapping of the desired type exists for the given key or a null
     * value is explicitly associated with the key.
     *
     * @param key a String, or null
     * @return a Parcelable value, or null
     */
    public <T extends Parcelable> T getParcelable(String key) {
        unparcel();
        Object o = mMap.get(key);
        if (o == null) {
            return null;
        }
        try {
            return (T) o;
        } catch (ClassCastException e) {
            typeWarning(key, o, "Parcelable", e);
            return null;
        }
    }