gistfile1.java

abstract public class Cliente {
    protected double saldo;

    public Cliente(float saldo){
        this.saldo = saldo;
    }

    public void depositar(float valor){
        this.saldo = this.saldo + valor;
    }

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

    public void sacar(float valor){
        this.saldo = this.saldo - (valor * this.taxa());
    }

    abstract protected double taxa();
}

public class ClienteComum extends Cliente {
    public ClienteComum(float saldo){
        super(saldo);
    }

    protected double taxa() {
        return 1.005;
    }
}

public class ClienteEspecial extends Cliente {
    public ClienteEspecial(float saldo){
        super(saldo);
    }

    protected double taxa() {
        return 1.001;
    }
}