如果 FileWriter 是通过 BufferedWriter 写入的，是否有必要关闭它?

问题描述

考虑如下 BufferedReader:

Consider a BufferedReader as below:

writer = new BufferedWriter(new FileWriter(new File("File.txt"), true));

在这种情况下，在应用程序结束时，我使用 writer.close()

In this case at the end of the application, I am closing the writer with writer.close()

这就够了吗?用 new FileWriter(new File("File.txt"), true) 创建的 FileWriter 不需要关闭吗?

Will this be enough? Won't that FileWriter created with new FileWriter(new File("File.txt"), true) need to be closed?

推荐答案

没有必要关闭它，因为 BufferedWriter 负责关闭它包装的 writer.

It is not necessary to close it, because BufferedWriter takes care of closing the writer it wraps.

说服你，这是BufferedWriter的close方法的源码:

To convince you, this is the source code of the close method of BufferedWriter:

public void close() throws IOException {
    synchronized (lock) {
        if (out == null) {
            return;
        }
        try {
            flushBuffer();
        } finally {
            out.close();
            out = null;
            cb = null;
        }
    }
}

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