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You can install Oracle Java 8 (JDK8 and JRE8) In Ubuntu 14.04, 13.10, 12.10, 12.04 and 10.04 Via PPA or Linux Mint machine easily

Add the webupd8team PPA repository and install Oracle Java 7/8 using the following commands:

install Oracle Java 7

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

install Oracle Java8

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

Check your installation with this command

java -version

or 

javac -version

Switching between Oracle Java 7 and Oracle Java 8

Switch to Oracle Java 8 (from Oracle java 7)

sudo update-java-alternatives -s java-8-oracle

switch to Oracle Java 8 (from Oracle java 7)

sudo update-java-alternatives -s java-7-oracle