java.io.PrintWriter和java.io.BufferedWriter之间的区别？ [英] Difference between java.io.PrintWriter and java.io.BufferedWriter?

问题描述

请查看下面的代码：

// A.class
File file = new File("blah.txt");
FileWriter fileWriter = new FileWriter(file);
PrintWriter printWriter = new PrintWriter(fileWriter);

// B.class
File file = new File("blah.txt");
FileWriter fileWriter = new FileWriter(file);
BufferedWriter bWriter = new BufferedWriter(fileWriter);

这两种方法有什么区别？

What is the difference between these two methods?

我们什么时候应该在BufferedWriter上使用PrintWriter？

When should we use PrintWriter over BufferedWriter?

推荐答案

BufferedWriter 和 PrintWriter 详细说明了这些差异。

The API reference for BufferedWriter and PrintWriter detail the differences.

使用PrintWriter的主要原因是可以访问printXn（如println（）。您实际上可以使用PrintWriter写入文件，就像使用System.out写入控制台一样。

The main reason to use the PrintWriter is to get access to the printXXX methods like println(). You can essentially use a PrintWriter to write to a file just like you would use System.out to write to the console.

BufferedWriter是一种写入a的有效方法。文件（或其他任何东西），因为它将缓冲Java内存中的字符（可能，取决于实现）下降到C以写入文件。

A BufferedWriter is an efficient way to write to a file (or anything else), as it will buffer the characters in Java memory before (probably, depending on the implementation) dropping to C to do the writing to the file.

没有PrintReader这样的概念;你得到的最接近的可能是 java.util.Scanner 。

There is no such concept as a "PrintReader"; the closest you will get is probably java.util.Scanner.

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