Windows下的Java控制台错误 [英] Java console bug under windows

问题描述

以下代码

System.out.println("Start");
String s = "";
//936 * 5 = 4680 characters
for (int i = 0; i < 937; i++){
    s += "1234 ";
}
System.out.println(s);
System.out.println("End");

在Windows控制台下的开始和结束之间生成一个空行，正如运行MacOS或Linux时所预期的那样。同样适用于写入文件而不是使用sysout。我试过多个windows机器。

produces an empty line between "Start" and "End" on the java console under windows, but works as expected when running MacOS or Linux. Same applies when writing to a file instead of using sysout. I've tried multiple windows machines. It doesn't matter whether I execute the method through eclipse or via cmd.

当您将1234更改为1234或12g4时，或者当数字的运行次数多于/少于936次，它与所有操作系统一样正常工作。

When you change "1234 " to "1234," or "12g4 " or when the number of runs is more/less than 936, it works as expected with all OS.

任何人都可以确认/是否有与此问题相关的已知错误？

Can anybody confirm this/is there a known bug concerning this issue?

推荐答案

我可以重现这一点，在Windows 7。它看起来像一个限制，由于操作系统在SWT，它似乎已经存在了很长一段时间（2002年）。它被标记为WONTFIX。请参见 GC＃drawString，drawText不能正确地每行显示超过10923个字符 a>。这是一个已知的错误。

I can reproduce this as well, under Windows 7. It looks like a limitation due to the OS in SWT, and it seems to have been around for a very long time (2002). It's marked as WONTFIX. See GC#drawString, drawText don't render more than 10923 characters per line correctly. So this is a known bug.

解决方法是去工作区 - >首选项 - >运行/调试 - >控制台，并设置固定宽度控制台像4000字符。这将是你的行后4000字符，这是一个痛苦，但至少你会得到你的所有输出。

The workaround is to go to the Workspace->Preferences->Run/Debug->Console and set the Fixed width console to be something like 4000 chars. This will wrap your lines after 4000 characters, which is a pain, but at least you'll get all of your output.

我试过Galileo（3.5），Helios （3.6）和靛蓝（3.7），并且都表现出行为，但更加奇怪的是，伽利略& Helios有一个limit = 818（4090 chars）和indigo = 936（4680）字符作为OP说。 4090让我想到一个操作系统限制（下一个将是4090 + 5 + crlf，> 4096），这与Eclipse / SWT中引发的错误相匹配。我不能解释为什么在接受的字符数有差别。我只能建议它是在操作系统中的东西。

I have tried Galileo (3.5), Helios (3.6) and Indigo (3.7), and all exhibit the behaviour, but wierdly, Galileo & Helios have a limit = 818 (4090 chars) and Indigo = 936 (4680) chars as the OP said. The 4090 makes me think of a OS limit (the next would be 4090 + 5 + crlf, > 4096), which matches with the bugs raised in Eclipse/SWT. I can't explain why there is a difference in the number of characters accepted. I can only suggest that it's something in the OS.

Eclipse中有一些重复的错误：

There are a number of duplicate bugs raised in Eclipse:

1. 错误19850 - 大字符串打印在控制台overstrikes /根据长度而消失


2. 错误44866 - 在变量视图中截断长字符


3. 错误104588 - 在某些情况下无法读取控制台输出

1. Bug 19850 - Large string printed in Console overstrikes/disappears depending on length
2. Bug 44866 - Truncate long strings in variables view
3. Bug 104588 - Unreadable console output under certain conditions

一切似乎都是由于： 错误11601 - 控制台在显示不含crlf的长字符串时挂起

Everything seems to have been a consequence of: Bug 11601 - console hangs while displaying long strings without crlf

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