Java：System.out.println（）背后的原因是什么？ [英] Java: What's the reason behind System.out.println() being that slow?

问题描述

对于可以在文本编辑器中完成的小型逻辑程序，为了跟踪，我使用经典的 System.out.println（）。

For small logical programs that can be done in a text editor, for tracing I use the classic System.out.println().

我想大家都知道在大量迭代的块中使用它是多么令人沮丧。为什么这么慢？这是什么原因？

I guess you all know how frustrating it is to use that in a block of high number of iterations. Why is it so slow? What's the reason behind it?

推荐答案

这与JVM无关。将文本打印到屏幕仅涉及用于绘制字母并且特别是滚动的OS的大量工作。如果你将System.out重定向到一个文件，它会更快。

This has nothing whatsoever to do with the JVM. Printing text to screen simply involves a lot of work for the OS in drawing the letters and especially scrolling. If you redirect System.out to a file, it will be much faster.

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