Qual Padrão de Projeto foi implementado nesse código?

Código fonte em Java para as questões 34 e 35.

package com.example. demo;

public class MyCalc {

public static void main(String[] args) {

double amount = 1000;

double intRate = 2;

int period = 12;

CalcSrv c = new CalcSrv(new CalcLC());

double fv = c.fValue (amount, intRate, period);

System.out.printf("VF of LC:%.2\n", fv);

c = new CalcSrv (new CalcCDB());

fv = c.fValue(amount,intRate, period);

System.out.printf("VE of CDB:%.2f", fv);

}

private static class CalcSrv {

private CalcFV calcsrv;

public CalcSrv(CalcFV calcsrv) {

this.calcsryv = calesrv;

}

public double fvalue(double amount, double intRate, int period) {

amount = amount + calcsrv.calc(amount, intRate, period);

return amount;

}

}

interface CalcFV {

double calc(double amount, double intRate, int period);

}

private static class CalcLC implements CalcFV{

@Override

public double calc(double amount, double intRate, int period)

return (amount * Math.pow(1 + intRate/100, period)) - amount;

}

}

private static class CalcCDB implements CalcFV{

@Override

public double calc(double amount, double intRate, int period){

double fv = amount * Math.pow(1 + intRate/100, period);

if (period >12)

return (fv - amount) * 0.85;

return (fv - amount) * 0.78;

}

}

}