How to apply java .class  to html?

For java .class file, I am sure I follow exactly what the tutorials said to apply it to htm file but it just doesn't work. I applied it by adding the applet element with the .class file as the attribute. Is that wrong? I googled for it and an article said it is probably because of wrong .class file name. I am very sure it is not the case for me and it must not be upper or lower case thing. Any hint to fix it?
My code is like this:
<applet code="file_name.class" name=file_name archive=file_name.jar height="x" width="y"></applet>

try this:
<applet code="whatever.class" width=100 height=100>
</applet>
Works for me.

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