java - Enabling a jbutton at startup -

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i have login form , mainform. in mainform have disabled jbutton. want enable jbutton if username login form "admin". have singleton controller instantiated in both forms. 

if(controller.admin=="admin"){jbutton.setenabled(true)};

but i’m new swing , don't know use code. tried using in mainform's constructor didn't work.

   if((controller.admin).equals("admin"))   {  jbutton.setenabled(true);   }

this correct code .please describe questions code


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