测试类

package 练习.商品入库系统;

import java.util.ArrayList;
import java.util.Scanner;
public class Test {
    public static final int Enrool = 1;
    public static final int Search = 2;
    public static final int Delect = 3;
    public static final int Exit   = 4;
    public static void main(String[] args) {
        //创建手机类的商品集合
        ArrayList<Phone> goods = new ArrayList<>();
        // 用户的操作
        Choice(goods);

    }
    // 登记商品
    public static void Enroll(ArrayList<Phone> goods){
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入商品品牌：");
        Phone goods1 = new Phone();
        String name = sc.next();
        goods1.setName(name);
        System.out.println("请输入商品价格：");
        double price = sc.nextDouble();
        goods1.setPrice(price);
        System.out.println("请输入商品型号：");
        String configuration = sc.next();
        goods1.setConfiguration(configuration);
        System.out.println("请输入商品库存数：");
        int storage = sc.nextInt();
        goods1.setStorage(storage);
        goods.add(goods1);
        System.out.println("添加成功");
    }
    // 查询商品
    public static void Search(ArrayList<Phone> goods){
        System.out.println("输入你要查询的商品品牌");
        Scanner sc = new Scanner(System.in);
        String name = sc.next();
        // 判断商品是否在仓库如果在就输出，不在就提示
        for (int i = 0; i < goods.size(); i++) {
            if(goods.get(i).getName().equals(name)){
                System.out.println("品牌："+goods.get(i).getName()+"\t价格："+goods.get(i).getPrice()+"元\t型号："+goods.get(i).getConfiguration()+"\t\t剩余库存："+goods.get(i).getStorage()+"部\t剩余库存总价值："+goods.get(i).Sum()+"元");
            } else if (i== goods.size()-1) {
                System.out.println("仓库无此品牌商品");
            }
        }
    }
    // 删除商品
    public static void Delete(ArrayList<Phone> goods){
        Scanner sc = new Scanner(System.in);
        System.out.println("输入要删除的品牌");
        String name = sc.next();
        // 检索要删除的品牌的所有型号
        for (int i = 0; i < goods.size(); i++) {
            if (goods.get(i).getName().equals(name)) {
                System.out.println("要删除的品牌所有型号信息如下：");
                System.out.println("品牌：" + goods.get(i).getName() + "\t价格：" + goods.get(i).getPrice() + "元\t型号：" + goods.get(i).getConfiguration() + "\t\t剩余库存：" + goods.get(i).getStorage() + "部\t剩余库存总价值：" + goods.get(i).Sum() + "元");
            } else if (i == goods.size() - 1) {
                System.out.println("仓库无此品牌商品");
            }
        }
        // 删除相应的品牌的特定型号的数据
        System.out.println("输入要删除的型号：");
        String configuration = sc.next();
        for (int i = 0; i < goods.size(); i++) {
            if (goods.get(i).getConfiguration().equals(configuration)) {
                goods.remove(i);
                System.out.println("删除成功");
            } else if (i == goods.size() - 1) {
                System.out.println("仓库无此型号商品");
            }
        }
    }
    // 用户的操作
    public static void Choice(ArrayList<Phone> goods){
        Scanner sc = new Scanner(System.in);
        // 结束标志
        do {
            System.out.println("请选择你的操作：1.登记商品\t2.查询商品\t3.删除商品\t4.退出");
            int choice = sc.nextInt();
            switch (choice) {
                // 登记商品
                case Enrool:
                    Enroll(goods);
                    break;
                // 查询商品
                case Search:
                    Search(goods);
                    break;
                // 删除商品
                case Delect:
                    Delete(goods);
                    break;
                // 退出
                case Exit:
                    System.exit(0);
                default:
                    System.out.println("请输入1 2 3 4 执行操作");
            }
        }while(true);
    }
}

手机类

package 练习.商品入库系统;

import java.math.BigDecimal;

public class Phone {

    private String name;
    private double price;
    private String configuration;
    private int storage;
    private BigDecimal sum;

    public Phone(){}
    public Phone(String name, double price, String configuration, int storage, BigDecimal sum) {
        this.name = name;
        this.price = price;
        this.configuration = configuration;
        this.storage = storage;
        this.sum = sum;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

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

    public String getConfiguration() {
        return configuration;
    }

    public void setConfiguration(String configuration) {
        this.configuration = configuration;
    }

    public int getStorage() {
        return storage;
    }

    public void setStorage(int storage) {
        this.storage = storage;
    }

    public BigDecimal getSum() {
        return sum;
    }

    public void setSum(BigDecimal sum) {
        this.sum = sum;
    }

    public BigDecimal Sum(){
        BigDecimal sum = BigDecimal.valueOf(getPrice() * getStorage());
        setSum(sum.setScale(2, BigDecimal.ROUND_HALF_DOWN));
        return getSum();
    }

}