java openjdk-7-jre-headless 和 openjdk-7-jre(jdk) 有什么区别？
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What is the difference between openjdk-7-jre-headless and openjdk-7-jre(jdk)?
提问by 3ppps
When I type for java -versionin command prompt in ubuntu I get following output
当我在 ubuntu 的命令提示符中输入java -version 时，我得到以下输出
The program 'java' can be found in the following packages:
* default-jre
* gcj-4.8-jre-headless
* openjdk-7-jre-headless
* gcj-4.6-jre-headless
* openjdk-6-jre-headless
Try: apt-get install <selected package>
I get above output as I do not have java install. I want to know difference between openjdk-7-jre-headlessand openjdk-7-jre
我得到了上面的输出，因为我没有安装 java。我想知道openjdk-7-jre-headless和openjdk-7-jre之间的区别
回答by Mureinik
To quote debian's wiki:
There are several virtual packages used in Debian for Java. These cover runtime compatibility and come in two flavours; headless (omits graphical interfaces) and normal.
Debian for Java 中使用了几个虚拟包。这些涵盖了运行时兼容性并有两种风格；无头（省略图形界面）和正常。
Or to be more exact, consider this description from Oracle:
或者更准确地说，请考虑Oracle 的以下描述：
Headlessmode is a system configuration in which the display device, keyboard, or mouse is lacking. Sounds unexpected, but actually you can perform different operations in this mode, even with graphic data.
Headless模式是一种系统配置，其中缺少显示设备、键盘或鼠标。听起来很意外，但实际上您可以在此模式下执行不同的操作，即使是图形数据。
回答by abarisone
回答by sumid
To add to previous answers the normal java depends on the headless and install some extra packages.
要添加到以前的答案，正常的 java 依赖于无头并安装一些额外的包。
I tried to compare dependencies of:
我试图比较依赖项：
- java-1.8.0-openjdk-headless-1.8.0.191.b12-0.el7_5.x86_64
- java-1.8.0-openjdk-1.8.0.191.b12-0.el7_5.x86_64
- java-1.8.0-openjdk-headless-1.8.0.191.b12-0.el7_5.x86_64
- java-1.8.0-openjdk-1.8.0.191.b12-0.el7_5.x86_64
The comparison done with yum installon Centos 7.6
yum install在 Centos 7.6 上完成的比较
The normal Java (in contrast to headless) installed following extras:
正常的 Java（与无头相比）安装了以下附加功能：
=============================|========|=========================|============|=======|=================| Package | Arch | Version | Repository | Size | Vulnerabilities | =============================|========|=========================|============|=======|=================| alsa-lib | x86_64 | 1.1.6-2.el7 | centos_7.6 | 424 k | 1 | 2005 | dejavu-fonts-common | noarch | 2.33-6.el7 | centos_7.6 | 64 k | - | | dejavu-sans-fonts | noarch | 2.33-6.el7 | centos_7.6 | 1.4 M | - | | fontconfig | x86_64 | 2.13.0-4.3.el7 | centos_7.6 | 254 k | 1 | 2016 | fontpackages-filesystem | noarch | 1.44-8.el7 | centos_7.6 | 9.9 k | - | | giflib | x86_64 | 4.1.6-9.el7 | centos_7.6 | 40 k | 5 | 2018 | java-1.8.0-openjdk-headless | x86_64 | 1:1.8.0.191.b12-0.el7_5 | centos_7.6 | 32 M | ? | | libICE | x86_64 | 1.0.9-9.el7 | centos_7.6 | 66 k | 1 | 2018 | libSM | x86_64 | 1.2.2-2.el7 | centos_7.6 | 39 k | - | | libX11 | x86_64 | 1.6.5-2.el7 | centos_7.6 | 606 k | 3 | 2013 | libX11-common | noarch | 1.6.5-2.el7 | centos_7.6 | 164 k | | | libXau | x86_64 | 1.0.8-2.1.el7 | centos_7.6 | 29 k | | | libXcomposite | x86_64 | 0.4.4-4.1.el7 | centos_7.6 | 22 k | | | libXext | x86_64 | 1.3.3-3.el7 | centos_7.6 | 39 k | | | libXi | x86_64 | 1.7.9-1.el7 | centos_7.6 | 40 k | | | libXrender | x86_64 | 0.9.10-1.el7 | centos_7.6 | 26 k | | | libXtst | x86_64 | 1.2.3-1.el7 | centos_7.6 | 20 k | | | libfontenc | x86_64 | 1.1.3-3.el7 | centos_7.6 | 31 k | | | libxcb | x86_64 | 1.13-1.el7 | centos_7.6 | 214 k | | | ttmkfdir | x86_64 | 3.0.9-42.el7 | centos_7.6 | 48 k | - | | xorg-x11-font-utils | x86_64 | 1:7.5-21.el7 | centos_7.6 | 104 k | 1 | 2008 | xorg-x11-fonts-Type1 | noarch | 7.5-9.el7 | centos_7.6 | 521 k | | | =============================|========|=========================|============|=======|=================|
Note that java-1.8.0-openjdk-headlessis a dependency of java-1.8.0-openjdk.
Also note that the concrete dependencies may differ on your system.
请注意，java-1.8.0-openjdk-headless是java-1.8.0-openjdk的依赖项。
另请注意，具体依赖项可能因您的系统而异。
