java球梆梆 java球梆梆

Question

结果与图片一致

结果与图片一致
结果与图片一致
结果与图片一致
结果与图片一致

Answer 1

新增IPrice接口并定义getPrice方法

package com.test;

public interface IPrice {

    public double getPrice();

}

新增Ingredient类并继承IPrice接口，类中定义name、price字段，getName属性，并实现getPrice方法

package com.test;

public class Ingredient implements IPrice{

    private String name;

    private double price;

    public Ingredient(String name, double price) {
        this.name = name;
        this.price = price;
    }

    @Override
    public double getPrice() {
        return this.price;
    }

    public String getName() {
        return this.name;
    }
}

新增Ingredients接口并定义addIngredient、getIngredients方法

package com.test;

import java.util.ArrayList;

public interface Ingredients {

    public void addIngredient(Ingredient ingredient);

    public ArrayList<Ingredient> getIngredients();

}

新增Meal并实现IPrice、Ingredients方法，类中定义name、price、ingredients属性并实现getPrice、addIngredient、getIngredients方法，新增getName方法

package com.test;

import java.util.ArrayList;

public class Meal implements IPrice, Ingredients {

    private String name;

    private double price;

    private ArrayList<Ingredient> ingredients = new ArrayList<>();

    @Override
    public double getPrice() {
        double p = 0.0;
        for (Ingredient ingredient : ingredients) {
            p += ingredient.getPrice();
        }
        return p;
    }

    @Override
    public void addIngredient(Ingredient ingredient) {
        ingredients.add(ingredient);
    }

    @Override
    public ArrayList<Ingredient> getIngredients() {
        return this.ingredients;
    }

    public String getName() {
        return this.name;
    }

}

新增测试类

package com.test;

import java.util.Objects;
import java.util.Scanner;

public class MainTest {

    public static void main(String[] args) {
        Meal Dinner = new Meal();
        while (true) {
            Scanner scanner = new Scanner(System.in);
            System.out.print("Add an ingredient to the meal: ");
            String name = scanner.next();
            System.out.print("Enter the price (double): ");
            double price = scanner.nextDouble();
            Dinner.addIngredient(new Ingredient(name, price));
            System.out.print("Do you want to add more ingredients? (enter stop to stop): ");
            String operation = scanner.next();
            if (Objects.equals("stop", operation)) {
                break;
            }
        }
        System.out.print("Dinner with ingredient:");
        for (Ingredient ingredient : Dinner.getIngredients()) {
            System.out.print(ingredient.getName());
            System.out.print(" - ");
            System.out.print(ingredient.getPrice());
            System.out.print("; ");
        }
        System.out.print(" Total bill: ");
        System.out.print(Dinner.getPrice());
    }

}

运行结果

Add an ingredient to the meal: rice
Enter the price (double): 1
Do you want to add more ingredients? (enter stop to stop): yes
Add an ingredient to the meal: beaf
Enter the price (double): 40
Do you want to add more ingredients? (enter stop to stop): yes
Add an ingredient to the meal: tomato
Enter the price (double): 6
Do you want to add more ingredients? (enter stop to stop): stop
Dinner with ingredient:rice - 1.0; beaf - 40.0; tomato - 6.0;  Total bill: 47.0
Process finished with exit code 0