blocks|key|869893|text|你实际上有两个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|869894|1)检查是否在无头环境下运行(无图形)。检查此方法：|869895|if+(GraphicsEnvironment.isHeadless())+{
+++++//+non+gui+mode
}+else+{
+++++//+gui+mode
}|code-block|syntax|javascript|869896|2)检查您运行的是哪种操作系统：|869897|System.getProperty("os.name")|869898|然而，第二(2)个问题将返回相同的名称，即使您在无头环境中操作。|869899|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

You actually have two questions:

1) Check if you run in a headless environment (no graphics). Check this method:

<pre><code>if (GraphicsEnvironment.isHeadless()) {
 // non gui mode
} else {
 // gui mode
}
</code></pre>

2) Check which OS you are running under:

<pre><code>System.getProperty("os.name")
</code></pre>

However, the second (2) question will return the same name even though you operate in a headless environment.

blocks|key|1084720|text|我建议添加一个命令行选项，用于确定是使用命令行还是图形用户界面，因为即使在GUI可用的环境中，用户也可能希望使用命令行界面。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1084721|您还可以通过System.console()检查控制台设备是否可用。|offset|length|1084722|entityMap|0|LINK|mutability|MUTABLE|url|http://download.oracle.com/javase/6/docs/api/java/lang/System.html#console%2528%2529^0|0|6|G|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I recommend adding a command line option that determines whether to use command-line or graphical user interface, because the user may want to use the command-line interface even in the environment where GUI is available.

You can also check if console device is available or not with <a href="http://download.oracle.com/javase/6/docs/api/java/lang/System.html#console%28%29" rel="nofollow">System.console()</a>.

blocks|key|869988|text|为什么不创建两个类，一个用于命令行，另一个用于GUI？再往下看，你可能想要创建两个产品，然后你可以交付无头产品，而不需要依赖于图形库。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|869989|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Why not create two classes, one for commandline and one for GUI? Further down you may want to create two products and then you can deliver the headless one without dependencies to graphic libs.

blocks|key|870057|text|dacwe和vitaut都是对的。我只想添加一条建议。当你设计你的应用程序时，你应该使用MVC+(模型-视图-控制器)模式。因此，如果它在UI模式下运行，则使用UIView，否则使用ConsoleView。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|870058|Dacwe建议您如何自动决定使用哪种模式。由于Java是跨平台语言，我认为操作系统的名称与您无关。由于系统具有图形化的环境，所以使用GraphicsEnvironment.isHeadless()。|offset|length|style|CODE|870059|System.console()将帮助您创建外壳控制的应用程序。|870060|entityMap^0|0|1U|W|0|0|G|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|K|$]]

Both dacwe and vitaut are right. 
I just wanted to add one recommendation. You should use MVC (model-view-controller) pattern when you are designing your application. So, if it is running in UI mode it uses UIView, otherwise the ConsoleView. 

Dacwe recommended you how can you decide automatically which mode to use. Due to Java is cross platform language I think the name is operating system is irrelevant for you. The fact that the system has graphic environment is more relevant, so use <code>GraphicsEnvironment.isHeadless()</code>. 

<code>System.console()</code> will help you to create shell controlled application.

blocks|key|870095|text|我正在寻找相同的解决方案，并提出了简单的使用参数，所以当我从命令行运行我的程序时，参数的长度是不同的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|870096|if(args.length+>+0)+{
++++System.out.println("command+line+mode");
}|code-block|syntax|javascript|870097|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I was looking for te same solution and came up with simply use an argument so when i run my program from comandline the args differs in length

<pre><code>if(args.length &gt; 0) {
 System.out.println("command line mode");
}
</code></pre>

I need my Java program to have two display modes: a GUI interface and a command line interface. If I run it in Windows, OS X, or another graphical environment I should get the GUI interface, but if I run it via SSH I should get the command line interface.

How can I detect whether a GUI can be displayed or if I should use a command line interface?

How to detect if a graphical interface is supported?

Windows

Java

我需要我的Java程序有两种显示模式: GUI界面和命令行界面。如果我在Windows、OS或其他图形环境中运行它，我应该会得到GUI界面，但是如果我通过SSH运行它，我应该会得到命令行界面。如何检测是否可以显示GUI，或者是否应该使用命令行界面？

问如何检测是否支持图形界面？
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