Design patterns 建议设计模式以添加多个费用和项目列表

我需要编写应用程序，因为我的计算如下：

基本费用

注册费；注册费%（基本费用）将因财产而异

销售税；（基本费+注册费）%，根据地点的不同而有所不同

服务税；（基本费+注册费+营业税）%

在这里，我需要配置，告诉我们是否包括销售税和服务税。 最后，我需要逐项列出基本费用、注册费、销售税和服务税

interface Payable {
    public float getAmount();
}

abstract class PayableDecorator implements Payable {
    private Payable base;

    public PayableDecorator(Payable base) {
        this.base = base;
    }

    public Payable getBase() {
        return base;
    }
}

class Fee implements Payable {
    private float value;

    public Fee(float value) {
        this.value = value;
    }

    public float getAmount() {
        return value;
    }
}

class RegistrationFee extends PayableDecorator {
    private float registrationPercentage;

    public RegistrationFee(Payable fee, float pct) {
        super(fee);
        registrationPercentage = pct;
    }

    public float getRegistrationPercentage() {
        return registrationPercentage();
    }

    public float getAmount() {
        return getBase() * (1 + registrationPercentage);
    }
}

class SaleTax extends PayableDecorator {
    private float salePercentage;

    public SaleTax(RegistrationFee registration, float pct) {
        super(registration);
        salePercentabe = pct;
    }

    public float getAmount() {
        return getBase() * (1 + salePercentage);
    }
}

class SericeTax extends PayableDecorator {
    private float servicePercentage;

    public SaleTax(SaleTax registration, float pct) {
        super(registration);
        salePercentabe = pct;
    }

    public float getAmount() {
        return getBase() * (1 + servicePercentage);
    }
}

我必须使用什么设计模式来实现这一点

我对装饰师和责任链感到困惑。在每件事情上我都要存储相应的费用。最后。需要列表为

Desc     Basic  Reg  Sales  Service  Total
------------------------------------------
Item 1   100    25   22     13       160 
Item 2   80     15   12     8        115
------------------------------------------
Total    180    40   34     25       275

---

我认为应该符合你的要求。

举个例子。在这里，我假设你必须缴纳销售税的注册费和服务税的销售税

interface Payable {
    public float getAmount();
}

abstract class PayableDecorator implements Payable {
    private Payable base;

    public PayableDecorator(Payable base) {
        this.base = base;
    }

    public Payable getBase() {
        return base;
    }
}

class Fee implements Payable {
    private float value;

    public Fee(float value) {
        this.value = value;
    }

    public float getAmount() {
        return value;
    }
}

class RegistrationFee extends PayableDecorator {
    private float registrationPercentage;

    public RegistrationFee(Payable fee, float pct) {
        super(fee);
        registrationPercentage = pct;
    }

    public float getRegistrationPercentage() {
        return registrationPercentage();
    }

    public float getAmount() {
        return getBase() * (1 + registrationPercentage);
    }
}

class SaleTax extends PayableDecorator {
    private float salePercentage;

    public SaleTax(RegistrationFee registration, float pct) {
        super(registration);
        salePercentabe = pct;
    }

    public float getAmount() {
        return getBase() * (1 + salePercentage);
    }
}

class SericeTax extends PayableDecorator {
    private float servicePercentage;

    public SaleTax(SaleTax registration, float pct) {
        super(registration);
        salePercentabe = pct;
    }

    public float getAmount() {
        return getBase() * (1 + servicePercentage);
    }
}

使用：

Payable totalTax = new ServiceTax(new SaleTax(new RegistrationFee(new Fee(100), .1), .03), .01);

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谢谢，我对装饰师和责任链感到困惑。在每件事情上我都要存储相应的费用。最后。需要列表作为描述基本注册销售服务总计项目1100 25 22 13 160项目280 15 12 8 115 180 40 34 25 275您能解释一下您的困惑吗？我会尽量说得更具体：）