public class AddNumbers implements Chain{

private Chain nextInChain;

// Defines the next Object to receive the

// data if this one can't use it

public void setNextChain(Chain nextChain) {

nextInChain = nextChain;

}

// Tries to calculate the data, or passes it

// to the Object defined in method setNextChain()

public void calculate(Numbers request) {

if(request.getCalcWanted() == "add"){

System.out.print(request.getNumber1() + " + " + request.getNumber2() + " = "+

(request.getNumber1()+request.getNumber2()));

} else {

nextInChain.calculate(request);

}

}

}