在 Ubuntu 安裝 Oracle JDK 7/8

Oracle JDK 8

安裝套件

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update

sudo apt-get install oracle-java8-installer

設定環境變數

sudo apt-get install oracle-java8-set-default

或者可以以下互動式指令進行設定

cykuo@cyvm:~$ sudo update-alternatives --config java
There is 1 choice 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-oracle/jre/bin/java   1081      manual mode


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

測試

cy@cyvm:~# java -version

java version "1.8.0_151"

Java(TM) SE Runtime Environment (build 1.8.0_151-b12)

Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)

cy@cyvm:~# javac -version

javac 1.8.0_151

參考

http://www.webupd8.org/2012/09/install-oracle-java-8-in-ubuntu-via-ppa.html

Oracle JDK 7

安裝套件

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

設定環境變數

sudo update-java-alternatives -s java-7-oracle
sudo apt-get install oracle-java7-set-default