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I thought I did. Isn`t this what you are talking about


Calculator referenca;

CalculatorEngine (Calculator referenca)
{
this.referenca=referenca;
}

Thanks for your answer, and I figured out where is the problem. It`s in this line
String displayText = referenca.getDisplay(); I think it means that I can not reach method(or function, do not know...

Hello,
I am a total begginer in JAVA and I could use your help. I am reading a book " Java Programming 24-Hour Trainer by Yakov Fain
" and I have a problem with creating a calculator.

here is my...