How do I delete j2sdk previous version ?

I have Downloaded J2sdk1.4.2_02 yesterday.I want to Uninstall j2sdk previous version jdk1.3.1_01.but I don't know where uninstall file is.I key "C:\cd j2sdk1.4.2_02,dir"in prompt,and reply message is " driver c has not volumn label". Now I define a few classes in a folter,but I can't compile its.however I can compile one class in a folter.What's the reason? Please tell me.Please Help!

I have Downloaded J2sdk1.4.2_02 yesterday. I want to
uninstall j2sdk previous version jdk1.3.1_01 but I
don't know where uninstall file is.You don't need to uninstall it.
I type "C:\cd j2sdk1.4.2_02", "dir" in prompt,
and reply message is "drive C has no volume label". So? You have not named your C drive - that is of no consequence.
Now I define a few
classes in a folter,but I can't compile its.however I
can compile one class in a folter.You create a number of class source files (with .java extension) and you can only compile one of them?
What is the error message you get?

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