Note: The following instructions are only for i386 and amd64 computers. For PowerPC machines, please look at the Ubuntu Wiki.
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To install the Java Runtime Environment (to run java programs), install the sun-java5-jre package from the Multiverse repository (see the section called "Extra Repositories").
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To install the Java Development Kit (to compile java programs), install the sun-java5-jdk package from the Multiverse repository (see the section called "Extra Repositories").
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To choose which java installation you want to use, run:
sudo update-alternatives --config java
and pick the option which you prefer.
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