Ubuntu16.04安裝oracle-java8-installer

本篇博客參考

1. 安裝默認JRE/JDK

• 更新

 sudo apt-get update

• 檢查是否安裝了Java

java -version

• 如果返回The program java can be found in the following packages，說明電腦上並沒有安裝Java，請執行：

sudo apt-get install default-jre

• 這將會安裝JRE(Java Runtime Environment)，如果需要安裝JDK(Java Development Kit)的話,請執行：

sudo apt-get install default-jdk

安裝Oracle JDK

sudo apt-get install python-software-properties
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update

安裝oracle-java8-installer

sudo apt-get install oracle-java8-installer

Setting the "JAVA_HOME"

sudo update-alternatives --config java

• 返回結果如下：

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: 

含義：

1. /usr/lib/jvm/java-8-oracle
2. /usr/lib/jvm/java-8-openjdk-amd64
3. /usr/lib/jvm/java-8-oracle

• 復制路徑信息，並修改/etc/environment文件：

sudo gedit /etc/environment

• 在最后一行添加：

JAVA_HOME="YOUR_PATH"

• 然后執行：

source /etc/environment

• 測試

echo $JAVA_HOME

大功告成!