Revolution

Installing the Default JRE/JDK First, update the package index. $ sudo apt-get update Next, install Java. Specifically, this command will install the Java Runtime Environment (JRE). $ sudo apt-get install default-jre There is another default Java installation called the JDK (Java Development Kit). The JDK is usually only needed if you are going to compile Java programs or if the software that will use Java specifically requires it. The JDK does contain the JRE, so there are no disadvantages if you install the JDK instead of the JRE, except for the larger file size. You can install the JDK with the following command: $ sudo apt-get install default-jdk Installing the Oracle JDK First, add Oracle's PPA, then update your package repository. $ sudo add-apt-repository ppa:webupd8team/java $ sudo apt-get update Then, depending on the version you want to install, execute one of the following commands: $ sudo apt-get install oracle-java6-installer $ sudo apt-get install ora