吸气剂/定位器(构图,Java,HW)

我有一个班级叫人,基本上看起来像:

public class Person
{
    String firstName;
    String lastName;
    String telephone;
    String email;

    public Person()
    {
       firstName = "";
       lastName = "";
       telephone = "";
       email = "";
    }

    public Person(String firstName, String lastName, String telephone, String email) 
    {
        this.firstName = firstName;
        this.lastName = lastName;
        this.telephone = telephone;
        this.email = email;
    }

    public String getFirstName()
    {
        return firstName;
    }

    public void setFirstName(String firstName)
    {
        this.firstName = firstName;
    }
 ....

使用这个类,我设置了一个名为Loan的抽象类,它看起来像:

public abstract class Loan
{   
    public void setClient(Person client)
    {
        this.client = client;
    }

    public Person getClient()
    {
        return client;
    }

    public void setLoanId(int nextId)
    {
        loanId = nextId;
        nextId++;
    }

    public int getLoanId()
    {
        return loanId;
    }

    public void setInterestRate(double interestRate)
    {
        this.interestRate = interestRate;
    }

    public double getInterestRate()
    {
        return interestRate;
    }

    public void setLoanLength(int loanLength)
    {
        this.loanLength = loanLength;
    }

    public int getLoanLength()
    {
        return loanLength;
    }

    public void setLoanAmount(double loanAmount)
    {
        this.loanAmount = loanAmount;
    }

    public double getLoanAmount(double loanAmount)
    {
        return loanAmount;
    }

    private Person client;
    private int loanId;
    private double interestRate;
    private int loanLength;
    private double loanAmount;
    private static int nextId = 1;

}

我必须和卡洛安一起延长贷款期限,看起来:

public class CarLoan extends Loan
{
    public CarLoan(Person client, double vehiclePrice, double downPayment, double salesTax,
                    double interestRate, CAR_LOAN_TERMS length)
    {
        super.setClient(client);
        super.setInterestRate(interestRate);
        this.client = client;
        this.vehiclePrice = vehiclePrice;
        this.downPayment = downPayment;
        this.salesTax = salesTax;
        this.length = length;

    }

    public void setVehiclePrice(double vehiclePrice)
    {
        this.vehiclePrice = vehiclePrice;
    }

    public double getVehiclePrice()
    {
        return vehiclePrice;
    }

    public void setDownPayment(double downPayment)
    {
        this.downPayment = downPayment;
    }

    public double getDownPayment()
    {
        return downPayment;
    }

    public void setSalesTax(double salesTax)
    {
        this.salesTax = salesTax;
    }

    public double getSalesTax()
    {
        return salesTax;
    }

    public String toString()
    {
        return getClass().getName() + "[vehiclePrice = " + vehiclePrice + '\n' 
                                        + "downPayment = " + downPayment + '\n'
                                        + "salesTax = " + salesTax 
                                        + "]";
    }

    public enum CAR_LOAN_TERMS {TWO_YEAR, THREE_YEAR, SIX_YEAR};
    private double vehiclePrice;
    private double downPayment;
    private double salesTax;

很少有问题。

(a)考虑到我在个人类中所做的,我在贷款类中对setclient所做的是否正确?(例如,this.client=client)

(b)我可以在一个方法中调用super两次吗?我必须从Carloan类的构造函数中设置Loan类的两个属性,我认为这是一种实现这一点的方法。

(C)您必须在构造函数或getter/setter方法中为枚举类型设置不同的属性吗?我在Carloan类中得到一个(this.length=length)错误,我不确定应该如何设置枚举值。谢谢!