Java

class Customer {
    private String name;
    // Other fields, constructors, get, set, etc.
    //
    public Customer(String name) {
        this.name=name;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name=name;
    }
    private double amountFor(Rental rental) {
        double result;
        // Another code.
        result=rental.getDays()*rental.getBasePrice();
        if (rental.getKind()==1) {
            result=result*1.5;
        }
        if (rental.getKind()==2) {
            result=result*2;
        }
        if (rental.getKind()==3) {
            result=result*2.5;
        }
        if (rental.getDays()>7) {
            result=result*3;
        }
        // Other calculation.
        return result;
    }
    // Other methods.
}
class Rental {
    private int kind;
    private int days;
    public double res;
    // Other fields, constructors, get, set, etc.
    //
    public Rental(int kind, int days) {
        this.kind=kind;
        this.days=days;
    }
    public int getKind() {
            return kind;
    }
    public void setKind(int kind) {
        this.kind=kind;
    }
    public int getDays() {
        return days;
    }
    public void setDays(int days) {
        this.days=days;
        }
    public double getBasePrice() {
        // Calculation of Price.
        // . . .
        return res;
    }
        // Other methods.
}