import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

// The Controller coordinates interactions

// between the View and Model

public class CalculatorController {

private CalculatorView theView;

private CalculatorModel theModel;

public CalculatorController(CalculatorView theView, CalculatorModel theModel) {

this.theView = theView;

this.theModel = theModel;

// Tell the View that when ever the calculate button

// is clicked to execute the actionPerformed method

// in the CalculateListener inner class

this.theView.addCalculateListener(new CalculateListener());

}

class CalculateListener implements ActionListener{

public void actionPerformed(ActionEvent e) {

int firstNumber, secondNumber = 0;

// Surround interactions with the view with

// a try block in case numbers weren't

// properly entered

try{

firstNumber = theView.getFirstNumber();

secondNumber = theView.getSecondNumber();

theModel.addTwoNumbers(firstNumber, secondNumber);

theView.setCalcSolution(theModel.getCalculationValue());

}

catch(NumberFormatException ex){

System.out.println(ex);

theView.displayErrorMessage("You Need to Enter 2 Integers");

}

}

}

}