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How to change the Java version/enviroment in Ubuntu

If you have installed multiple Java-Versions and you want to configure your system to use one of them as the default, there is a really simple command to achieve that goal:

1) Check Java version

$ java -version
  • The output should look similar to something like this:
    java version "1.7.0_147-icedtea"
    OpenJDK Runtime Environment (IcedTea7 2.0) (7~b147-2.0-0ubuntu0.11.10.1)
    OpenJDK 64-Bit Server VM (build 21.0-b17, mixed mode)
    

    As you can see my systems default is set to java-7-openjdk (1.7.0_147-icedtea).

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