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sudo update-alternatives --config javac
sudo update-alternatives --config javaws

java -version

#
java version "1.8.0_31"
Java(TM) SE Runtime Environment (build 1.8.0_31-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.31-b07, mixed mode)

There are 4 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-7-oracle/jre/bin/java          1076      auto mode
  1            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      manual mode
* 2            /usr/lib/jvm/java-7-oracle/jre/bin/java          1076      manual mode
  3            /usr/lib/jvm/jdk1.8.0/bin/java                   1         manual mode
  4            /usr/lib/jvm/jdk1.8.31/bin/java                  1         manual mode

Press enter to keep the current choice[*], or type selection number: 4
update-alternatives: using /usr/lib/jvm/jdk1.8.31/bin/java to provide /usr/bin/java (java) in manual mode

sudo update-alternatives --config java

sudo chmod a+x /usr/bin/java 
sudo chmod a+x /usr/bin/javac 
sudo chmod a+x /usr/bin/javaws
sudo chown -R root:root /usr/lib/jvm/jdk1.8.31

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.8.31/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.8.31/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.8.31/bin/javaws" 1

sudo mkdir -p /usr/lib/jvm
sudo mv ./jdk1.8.0_31 /usr/lib/jvm/jdk1.8.31

tar -xf jdk-8u31-linux-x64.tar.gz

# Java 8 JDK
wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http://www.oracle.com/; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u31-b13/jdk-8u31-linux-x64.tar.gz"

# Java 8 JRE
wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http://www.oracle.com/; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u31-b13/jre-8u31-linux-x64.tar.gz"

# Java 7 JDK
wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http://www.oracle.com/; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u75-b13/jdk-7u75-linux-x64.tar.gz"

# Java 7 JDK
wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http://www.oracle.com/; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u75-b13/jre-7u75-linux-x64.tar.gz"