是否有必要关闭FileWriter，前提是它是通过BufferedWriter编写的？

问题描述

考虑如下的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，我将关闭编写器 with writer.close（）

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

这还够吗？用新FileWriter创建的FileWriter（新文件（File.txt），true）是否需要关闭？

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负责关闭它包装的编写器。

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

To说服你，这是BufferedWriter的close方法的源代码：

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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