Ubuntu 16.10 安装 java 1.7

Ubuntu 16.10 默认自带的是 java 1.8

java -version
openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-8u131-b11-0ubuntu1.16.10.2-b11)
OpenJDK 64-Bit Server VM (build 25.131-b11, mixed mode)

由于项目需要，现在需要安装 java 1.7。安装方法

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer

安装完成之后，会发现版本已经变成了 java 1.7

java -version
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)

不同版本切换

sudo update-alternatives --config java
[sudo] password for zhongwei: 
There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-7-oracle/jre/bin/java          1082      auto mode
  1            /usr/lib/jvm/java-7-oracle/jre/bin/java          1082      manual mode
  2            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manual mode

例如，这里选择2，回车，就会发现默认 java 版本由 1.7 被切换到了 1.8

java -version
openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-8u131-b11-0ubuntu1.16.10.2-b11)
OpenJDK 64-Bit Server VM (build 25.131-b11, mixed mode)

安装 openjdk7

sudo add-apt-repository ppa:openjdk-r/ppa  
sudo apt-get update   
sudo apt-get install openjdk-7-jdk  

参考

• How To Install Java with Apt-Get on Ubuntu 16.04 | DigitalOcean

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