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From: Martin Gregorie <martin@address-in-sig.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: It doesn't see my 'if' statements
Date: Tue, 26 Jun 2012 23:44:33 +0000 (UTC)
Organization: UK Free Software Network
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On Tue, 26 Jun 2012 15:52:41 -0700, markspace wrote:

> 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.

As far as I can see the result of your calculation is never written to 
gui.number1


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