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From: markspace <-@.>
Newsgroups: comp.lang.java.programmer
Subject: Re: It doesn't see my 'if' statements
Date: Tue, 26 Jun 2012 15:52:41 -0700
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On 6/26/2012 3:49 PM, bilsch wrote:

> public void actionPerformed(ActionEvent event){
>       String btn = event.getActionCommand();
>             // opflag clears display
>             if (opFlag = true){


This is assignment, not == test.  You need two == for equals testing.

If you are using NetBeans, it should have flagged this with a warning. 
Mine does.