Question

我有用于读取JSON文件的代码：

Gson gson = new Gson();
BufferedReader bufferedReader = null;
try {
    bufferedReader = new BufferedReader(new FileReader(path));
    JsonObject data = gson.fromJson(bufferedReader, JsonObject.class);
    Log.d(TAG, "DATA: " + data.toString());
} catch (FileNotFoundException e) {
    e.printStackTrace();
} finally {
    if (bufferedReader != null) {
        try {
            bufferedReader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

该代码似乎可以正常工作，但是在logcat中，我收到了以下3行：

com.example.package W/System: A resource failed to call close. 
com.example.package W/System: A resource failed to call end. 
com.example.package W/System: A resource failed to call close.

是正常现象还是我做错了什么？预先非常感谢。

Answer 1

好吧，@ deHaar是正确的：

try (BufferedReader bufferedReader = new BufferedReader(new FileReader(path))) {
    JsonObject data = gson.fromJson(bufferedReader, JsonObject.class);
    Log.d(TAG, "DATA: " + data.toString());
} catch (FileNotFoundException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}

这样，我不会收到警告。但是我不明白为什么。如果有人可以在评论中写出来，我将不胜感激。谢谢。

如何正确关闭BufferedReader

1 个答案: