用Java 函数的参数和返回值。（自定义一个计算器，输入几个头，几个爪，几碗面，单价自己定，并且计算总价）（使用四种方式来完成）

1. 使用基本数据类型实现：

public class Calculator {
    public static void main(String[] args) {
        int head = 2;
        int claw = 4;
        int bowl = 3;
        double price = 12.5;
        double total = calculateTotal(head, claw, bowl, price);
        System.out.println("总价为：" + total);
    }

    public static double calculateTotal(int head, int claw, int bowl, double price) {
        return (head * 2 + claw * 3 + bowl * 1.5) * price;
    }
}

2. 使用数组实现：

public class Calculator {
    public static void main(String[] args) {
        int[] nums = new int[]{2, 4, 3};
        double price = 12.5;
        double total = calculateTotal(nums, price);
        System.out.println("总价为：" + total);
    }

    public static double calculateTotal(int[] nums, double price) {
        return (nums[0] * 2 + nums[1] * 3 + nums[2] * 1.5) * price;
    }
}

3. 使用对象实现：

public class Calculator {
    public static void main(String[] args) {
        Goods goods = new Goods(2, 4, 3, 12.5);
        double total = calculateTotal(goods);
        System.out.println("总价为：" + total);
    }

    public static double calculateTotal(Goods goods) {
        return (goods.getHead() * 2 + goods.getClaw() * 3 + goods.getBowl() * 1.5) * goods.getPrice();
    }
}

class Goods {
    private int head;
    private int claw;
    private int bowl;
    private double price;

    public Goods(int head, int claw, int bowl, double price) {
        this.head = head;
        this.claw = claw;
        this.bowl = bowl;
        this.price = price;
    }

    public int getHead() {
        return head;
    }

    public void setHead(int head) {
        this.head = head;
    }

    public int getClaw() {
        return claw;
    }

    public void setClaw(int claw) {
        this.claw = claw;
    }

    public int getBowl() {
        return bowl;
    }

    public void setBowl(int bowl) {
        this.bowl = bowl;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }
}

4. 使用Map实现：

import java.util.HashMap;
import java.util.Map;

public class Calculator {
    public static void main(String[] args) {
        Map<String, Integer> goods = new HashMap<>();
        goods.put("head", 2);
        goods.put("claw", 4);
        goods.put("bowl", 3);
        double price = 12.5;
        double total = calculateTotal(goods, price);
        System.out.println("总价为：" + total);
    }

    public static double calculateTotal(Map<String, Integer> goods, double price) {
        int head = goods.get("head");
        int claw = goods.get("claw");
        int bowl = goods.get("bowl");
        return (head * 2 + claw * 3 + bowl * 1.5) * price;
    }
}