在Ubuntu上使用Java-程序包冲突？

Question

On linux, I often launch and compile from the command line (java/javac) Though, Java isn't the only language I use - I use C++, and for that I have GCC. Because I have both java and GCC, for example, there are more than one instance of 'javac':

From the terminal, passing 'javac' with no arguments:

The program 'javac' can be found in the following packages: * openjdk-6-jdk * ecj * gcj-4.4-jdk * gcj-4.5-jdk Try: sudo apt-get install

Is there a way to specify which package I want to use? Either per-command, or set a default? I would prefer not to remove one or the other.

Thanks - Zac

Answer 1

  update-java-alternatives -s openjdk-6-jdk

On Ubuntu there is a system called alternatvies installed, to switch between different implementations:

update-java-alternatives

man update-java-alternatives 

shows the usage:

NAME
       update-java-alternatives - update alternatives for jre/sdk installations

SYNOPSIS
       update-java-alternatives [--jre] [--plugin] [-t|--test|-v|--verbose]
             -l|--list [<jname>]
             -s|--set <jname>
             -a|--auto
             -h|-?|--help

If you get problems with swing, you should try sun-java, which you're missing in your list. :)

As 'KindOfAutomatic suggests:

alternatives --config java
alternatives --config javac

is the same thing in a different way. Instead of 'java', you can config your favorite editor, x-www-browser, pager and so on as well. Have a look at

ls /etc/alternatives 

to get an impression, what's already done there.