Which javas? (Was java / iceweasel)

[Ken Heard <ken@heard.name>]

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In my box the command "update-alternatives --config java" returns the
following:

There are 3 alternatives which provide `java'.

  Selection    Alternative
- -----------------------------------------------
          1    /usr/bin/gij-4.3
*+        2    /usr/lib/jvm/java-gcj/jre/bin/java
          3    /usr/lib/jvm/java-6-sun/jre/bin/java

What is the difference among the three?

Ken Heard
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