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
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下载指定版本
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| $ sudo apt install -y openjdk-8-jdk
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或直接下载默认版本
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| $ sudo apt install -y default-jdk
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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
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下载
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| $ sudo apt-get install oracle-java8-installer
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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:
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* 为当前选中版本，输入相应数字即可更改版本