IndexOf() Method in JSP Help

I have a jsp with a textarea field. which gets user Id, The user can enter any text inside that . The problem here is I dont want the user enters any html tags inside that such as ">" or "<", I know I can use method indexOf(), but I dont know how??? can you please advice me.
following is sample of my code at the moment:
String ID = request.getParameter("id");
if (ID.equals("<") || ID.equals("<")) {...}
Thank you inadvance

String ID = request.getParameter("id");
if (ID.indexOf("<")>-1 || ID.indexOf(">")>-1) {...}Message was edited by:
jgalacambra

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IndexOf() Method in JSP *Help*

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IndexOf() Method in JSP Help