貨物類：編號，名稱，價格，庫存

新增貨物：如果超市沒有該貨物，則新增

進貨：對已有貨物，增加庫存

修改：修改某個貨物的價格，庫存

下架：將某個貨物刪除

查詢：列印目前超市在售的貨物清單

測試類：

package com.zhiyou.shopping;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Scanner;

import com.sweet.test.URLitem;

public class Test {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		List<GoodsManagement> goods = new ArrayList<>();
		boolean isOK = true;
		while (isOK) {
			int i = screen();
			if (i == 6) {
				isOK = false;
				System.out.println("謝謝使用！");
			}
			function(i,goods);
		}

	}
	
	public static int screen() {
		System.out.println("-------------------歡迎進入貨物管理系統-----------------\n");
		System.out.println("                1.新增貨物：如果超市沒有該貨物，則新增");
		System.out.println("                2.進貨：對已有貨物，增加庫存");
		System.out.println("                3.修改：修改某個貨物的價格，庫存");
		System.out.println("                4.下架：將某個貨物刪除");
		System.out.println("                5.查詢：列印目前超市在售的貨物清單");
		System.out.println("                6.退出");
		System.out.println("\n------------------------------------------------------");
		System.out.println("請輸入你的操作：");
		Scanner scanner = new Scanner(System.in);
		int i = scanner.nextInt();
		return i;
	}
	
	public static void function(int i,List<GoodsManagement> goods) {
		
		switch (i) {
		case 1:
			addGoods(goods);
			break;
		case 2:
			add(goods);
			break;
		case 3:
			reviseInfo(goods);
			break;
		case 4:
			deleteUrl(goods);
			break;
		case 5:
			queryInfo(goods);
			break;
		default:
			break;
		}
	}
	
	public static void addGoods(List<GoodsManagement> goods) {
		
		Scanner scanner = new Scanner(System.in);
		System.out.print("請輸入編號：");
		String id = scanner.next();
		System.out.print("請輸入名稱：");
		String name = scanner.next();
		System.out.print("請輸入價格：");
		double price = scanner.nextDouble();
		System.out.print("請輸入庫存：");
		int num = scanner.nextInt();
		
		Iterator<GoodsManagement> iterator = goods.iterator();
		if (goods.size() != 0) {
			boolean isOK = false;
			while (iterator.hasNext()) {
				GoodsManagement goodsManagement = iterator.next();
				if (goodsManagement.getName().equals(name)) {
					int num1 = goodsManagement.getNum() + num;
					goodsManagement.setNum(num1);
					isOK = true;
				}
			}
			if (isOK) {
				System.out.println("新增貨物成功！");
			}else {
				goods.add(new GoodsManagement(id, name, price, num));
			}
			
			
		}else {
//			直接新增
			goods.add(new GoodsManagement(id, name, price, num));
		}
	}
	
	public static void add(List<GoodsManagement> goods) {
		
		Scanner scanner = new Scanner(System.in);
		System.out.print("請輸入要增加庫存的商品名稱：");
		String name = scanner.next();
		System.out.print("要增加的庫存量為：");
		int num = scanner.nextInt();
		boolean isOK = false;
		Iterator<GoodsManagement> iterator = goods.iterator();
		while (iterator.hasNext()) {
			GoodsManagement goodsManagement = iterator.next();
			if (goodsManagement.getName().equals(name)) {
				int num1 = goodsManagement.getNum() + num;
				goodsManagement.setNum(num1);
				isOK = true;
			}
		}
		if (isOK) {
			System.out.println("進貨成功！");
		}else {
			System.out.println("沒有該商品，進貨失敗！");
		}
	}
	
	public static void reviseInfo(List<GoodsManagement> goods) {
		
		if (goods.size() != 0) {
			Scanner scanner = new Scanner(System.in);
			System.out.print("請輸入要修改的商品名稱：");
			String name = scanner.next();
			System.out.print("請輸入修改的價格：");
			double price = scanner.nextDouble();
			System.out.print("請輸入修改的庫存量為：");
			int num = scanner.nextInt();
			
			boolean isOK = false;
			
			Iterator<GoodsManagement> iterator = goods.iterator();
			while (iterator.hasNext()) {
				GoodsManagement goodsManagement = iterator.next();
				if (goodsManagement.getName().equals(name)) {
					goodsManagement.setPrice(price);
					goodsManagement.setNum(num);
					isOK = true;
				}
			}
			if (isOK) {
				System.out.println("修改"+name+"商品的價格和庫存成功！");
			}else {
				System.out.println("修改失敗！");
			}
		}else {
			System.out.println("商品為空，無法修改！");
		}
		
		
	}
	public static void deleteUrl(List<GoodsManagement> goods) {
		
		if (goods.size() != 0) {
			Scanner scanner = new Scanner(System.in);
			System.out.print("請輸入要下架的商品名稱：");
			String name = scanner.next();
			System.out.println("是否將該商品全部下架？還是隻下架該商品中的過期商品？ 1 全部下架  2下架過期商品：");
			int key = scanner.nextInt();
			Iterator<GoodsManagement> iterator = goods.iterator();
			if (key == 1) {
				while (iterator.hasNext()) {
					GoodsManagement goodsManagement = iterator.next();
					if (goodsManagement.getName().equals(name)) {
						iterator.remove();
						System.out.println("全部下架成功！");
					}
				}
			}else {
				System.out.println("請輸入要下架的商品的數量：");
				int num = scanner.nextInt();
				while (iterator.hasNext()) {
					GoodsManagement goodsManagement = iterator.next();
					if (goodsManagement.getName().equals(name)) {
						int num1 = goodsManagement.getNum() - num;
						goodsManagement.setNum(num1);
						System.out.println("下架部分商品成功！");
					}
				}
			}
		}else {
			System.out.println("商品為空，無法下架！");
		}
		
		
	}
	public static void queryInfo(List<GoodsManagement> goods) {
		if (goods.size() != 0) {
			boolean isOK = false;
			Iterator<GoodsManagement> iterator = goods.iterator();
			while (iterator.hasNext()) {
				GoodsManagement goodsManagement = iterator.next();
				System.out.println(goodsManagement);
				isOK = true;
			}
			if (!isOK) {
				System.out.println("查詢失敗！");
			}
		}else {
			System.out.println("商品為空，無法展示！");
		}
		
		
	}
	
}
 

/**
 * 
 */
package com.zhiyou.shopping;

/**
 * @author Administrator
 *
 */
public class GoodsManagement {
	
	private String id;
	private String name;
	private double price;
	private int num;
	
	public GoodsManagement(String id, String name, double price, int num) {
		super();
		this.id = id;
		this.name = name;
		this.price = price;
		this.num = num;
	}

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	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 int getNum() {
		return num;
	}

	public void setNum(int num) {
		this.num = num;
	}

	@Override
	public String toString() {
		return "編號：" + id + "  名稱：" + name + "  價格：" + price + "  庫存：" + num + "\n";
	}


}