Duvida Ex. 7 Aula 1

class Conta2{
    protected double saldo;

    public double getSaldo(){
        return this.saldo;
    }

    public void deposita(double valor){
        this.saldo += valor;
    }

    public void saca(double valor){
        this.saldo -= valor;
    }

    public void multiplicador(double taxa){
        this.saldo += this.saldo * taxa;
    }
}


class ContaCorrente extends Conta2{
    public void multiplicador(double taxa){
        this.saldo += this.saldo * taxa * 2;
    }


}


class ContaPoupanca extends Conta2{
    public void multiplicador(double taxa){
        this.saldo += this.saldo * taxa * 3;
    }

    public void deposita(double valor){
        this.saldo += valor - 0.10;
    }

}


class Atualiza{
    private double saldoTotal = 0;
    private double selic;

    public void atualizador(double selic){
         this.selic = selic;
    }

    public void roda(Conta2 gui){
        System.out.println("=====================");
        System.out.println("Saldo anterior :" + gui.getSaldo());
        gui.multiplicador(this.selic);
        System.out.println("Novo saldo :" + gui.getSaldo());
    }
    public double getSaldoTotal(){
        return this.saldoTotal;
    }
}


class Teste {
    public static void main(String[] args){
        Conta2 gui = new Conta2();
        ContaCorrente pedro = new ContaCorrente();
        ContaPoupanca lucas = new ContaPoupanca();


        gui.deposita(1000);
        pedro.deposita(1000);
        lucas.deposita(1000);


        Atualiza mostra = new Atualiza(0.01);
        mostra.roda(gui);
        mostra.roda(pedro);
        mostra.roda(lucas);

        System.out.println("=============================");
        System.out.println("Saldo total :" + mostra.getSaldoTotal());


    }
}

λ javac Conta2.java

Conta2.java:79: error: variable mostra is already defined in method main(String[]) double mostra = (0.01);