完全卸载并重新安装OpenJDK

我搜索了askubuntu并尝试了建议，但失败了。我尝试了以下问题：如何完全卸载Java？

1.我运行sudo apt-cache search openjdk得到以下内容：

openjdk-6-dbg - Java runtime based on OpenJDK (debugging symbols) openjdk-6-demo - Java runtime based on OpenJDK (demos and examples) openjdk-6-doc - OpenJDK Development Kit (JDK) documentation openjdk-6-jdk - OpenJDK Development Kit (JDK) openjdk-6-jre - OpenJDK Java runtime, using Hotspot JIT openjdk-6-jre-headless - OpenJDK Java runtime, using Hotspot JIT (headless) openjdk-6-jre-lib - OpenJDK Java runtime (architecture independent libraries) openjdk-6-source - OpenJDK Development Kit (JDK) source files icedtea-7-jre-jamvm - Alternative JVM for OpenJDK, using JamVM openjdk-6-jre-zero - Alternative JVM for OpenJDK, using Zero/Shark openjdk-7-dbg - Java runtime based on OpenJDK (debugging symbols) openjdk-7-demo - Java runtime based on OpenJDK (demos and examples) openjdk-7-doc - OpenJDK Development Kit (JDK) documentation openjdk-7-jdk - OpenJDK Development Kit (JDK) openjdk-7-jre - OpenJDK Java runtime, using Hotspot JIT openjdk-7-jre-headless - OpenJDK Java runtime, using Hotspot JIT (headless) openjdk-7-jre-lib - OpenJDK Java runtime (architecture independent libraries) openjdk-7-jre-zero - Alternative JVM for OpenJDK, using Zero/Shark openjdk-7-source - OpenJDK Development Kit (JDK) source files

2.运行sudo apt-get remove openjdk得到以下内容： Reading package lists... Done Building dependency tree Reading state information... Done Package openjdk-7-jdk is not installed, so not removed 0 upgraded, 0 newly installed, 0 to remove and 182 not upgraded.

uninstall openjdk

— 简文
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得到答案： sudo dpkg --list; sudo dpkg --list | grep -i jdk谢谢@izx

— janwen 2012年

Answers:

您无法删除OpenJDK 7，因为它尚未安装。如果要删除OpenJDK 6，请尝试sudo apt-get remove openjdk-6-jdk或sudo apt-get remove default-jdk。

apt-cache search仅显示您可用的软件包，而不显示您已安装的软件包。为此，请尝试sudo dpkg --list；sudo dpkg --list | grep -i jdk将向您显示系统上安装的所有与JDK相关的软件包。

— ish
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如何搜索已安装的软件包？可用软件包和已安装软件包有什么区别？

— 1

我尝试都赞扬您的帖子，获得相同的结果：

Reading package lists... Done Building dependency tree        Reading state information... Done Package default-jdk is not installed, so not removed 0 upgraded, 0 newly installed, 0 to remove and 182 not upgraded.

— janwen 2012年

请使用输出更新问题sudo dpkg --list | grep -i jdk。可用表示“下载后可以安装”，而表示“已在系统上安装IS”

— ish

谢谢@izx我成功删除了openjdk。如何解决这个问题。

— 1

请记住，如果有帮助，请接受答案-这也将结束问题。谢谢:)

— ish

运行以下命令，使您可以选择要进行默认设置的Java安装：

sudo update-alternatives --config java

There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                           Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-6-openjdk-i386/jre/bin/java   1061      auto mode
  1            /usr/lib/jvm/java-6-openjdk-i386/jre/bin/java   1061      manual mode
  2            /usr/lib/jvm/java-7-oracle/jre/bin/java         1         manual mode

— 法扎尔·普里巴迪（Faizal Pribadi）
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最近，我试图完全重新安装Java。这可以帮助您将其删除：

sudo apt-get remove openjdk*
sudo apt-get clean

然后，如果需要，安装Java：

sudo apt-get install openjdk-8-jdk

遵循这些步骤可以帮助我解决问题。

— Machitgarha
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