In what directory are you looking for the file .bash_profile? It it isn't in your home directory, you can always create it.
If you have the GNU version of java installed, the files /usr/bin/javac and /usr/bin/java may be linked to the GNU version even after you install the SUN version. So you should redo those links.
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"Never let the task you are trying to accomplish distract you from the study of computers."
There are several files you could set the variable in, .bash_profile, .profile, .bashrc, /etc/profile. Each one serves a slightly different purpose (/etc/profile is global, .profile is used by all bourne-derived shells, not just bash, etc)