Ubuntu 16.04 安装 JDK

现以更新安装 Java 11 版本，传送门 Ubuntu 如何安装 Java 11

Ubuntu 安装 JDK 与 CentOS 很相似，但更简单。



OpenJDK

查找 JDK

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$ sudo apt update -y
$ sudo apt search jdk

default-jdk/xenial 2:1.8-56ubuntu2 amd64
  Standard Java or Java compatible Development Kit

default-jdk-doc/xenial 2:1.8-56ubuntu2 amd64
  Standard Java or Java compatible Development Kit (documentation)

default-jdk-headless/xenial 2:1.8-56ubuntu2 amd64
  Standard Java or Java compatible Development Kit (headless)

default-jre/xenial 2:1.8-56ubuntu2 amd64
  Standard Java or Java compatible Runtime

default-jre-headless/xenial 2:1.8-56ubuntu2 amd64
  Standard Java or Java compatible Runtime (headless)

openjdk-8-dbg/xenial-updates,xenial-security 8u171-b11-0ubuntu0.16.04.1 amd64
  Java runtime based on OpenJDK (debugging symbols)

openjdk-8-demo/xenial-updates,xenial-security 8u171-b11-0ubuntu0.16.04.1 amd64
  Java runtime based on OpenJDK (demos and examples)

openjdk-8-doc/xenial-updates,xenial-security 8u171-b11-0ubuntu0.16.04.1 all
  OpenJDK Development Kit (JDK) documentation

openjdk-8-jdk/xenial-updates,xenial-security 8u171-b11-0ubuntu0.16.04.1 amd64
  OpenJDK Development Kit (JDK)

openjdk-8-jdk-headless/xenial-updates,xenial-security 8u171-b11-0ubuntu0.16.04.1 amd64
  OpenJDK Development Kit (JDK) (headless)

openjdk-8-jre/xenial-updates,xenial-security 8u171-b11-0ubuntu0.16.04.1 amd64
  OpenJDK Java runtime, using Hotspot JIT

openjdk-8-jre-headless/xenial-updates,xenial-security 8u171-b11-0ubuntu0.16.04.1 amd64
  OpenJDK Java runtime, using Hotspot JIT (headless)

openjdk-8-jre-jamvm/xenial-updates,xenial-security 8u171-b11-0ubuntu0.16.04.1 amd64
  Transitional package for obsolete JamVM for OpenJDK

openjdk-8-source/xenial-updates,xenial-security 8u171-b11-0ubuntu0.16.04.1 all
  OpenJDK Development Kit (JDK) source files

下载指定版本

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$ sudo apt install -y openjdk-8-jdk

或直接下载默认版本

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$ sudo apt install -y default-jdk

Oracle JDK

Ubuntu 安装 Oracle JDK 要方便的很多

添加 Oracle PPA 到软件仓库中

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$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt update -y

下载

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$ sudo apt-get install oracle-java8-installer

选择版本

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$ 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-8-oracle/jre/bin/java          1081      auto mode
  1            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manual mode
* 2            /usr/lib/jvm/java-8-oracle/jre/bin/java          1081      manual mode

Press <enter> to keep the current choice[*], or type selection number:

* 为当前选中版本，输入相应数字即可更改版本

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