Java_7.2库存管理

package demo1;

import java.util.ArrayList;
import java.util.Scanner;

public class Demo1 {
	public static void main(String[] args) {
		ArrayList<Goods> array = new ArrayList<Goods>();
		while(true) {			//功能块的选择 一直循环之道用户选择退出
			int num = chooseFunction();    //选择功能
			switch(num) {
			case 1:
				printGoods(array);				//功能1：打印所有商品
				break;
			case 2:								//功能2：添加商品
				addGoods(array);
				break;
			case 3:								//功能3：修改商品
				updateGoods(array);
				break;
			case 4:								//功能4：删除商品
				deleteGoods(array);
				break;
			case 5:								//退出
				return;
			default:							//其他情况
				System.out.println("无此功能");
			}
		}
	}
	//选择功能
	public static int chooseFunction() {
		System.out.println("=========商品库存管理=========");
		System.out.println("1.查看商品");
		System.out.println("2.添加商品");
		System.out.println("3.修改商品");
		System.out.println("4.删除商品");
		System.out.println("5.退出");
		System.out.println("请选择序号：");
		Scanner sc = new Scanner(System.in);
		int index = sc.nextInt();
		return index;
	}
	//功能1：打印所有商品
	public static void printGoods(ArrayList<Goods> array) {
		System.out.println("编号\t品牌\t尺寸\t价格\t数量");
		for (int i = 0; i < array.size(); i++) {
			Goods g = array.get(i);
			System.out.println((i+1)+"\t"+g.brand+"\t"+g.size+"\t"+g.price+"\t"+g.count);
		}
	}
	//功能2：添加商品
	public static void addGoods(ArrayList<Goods> array) {
		Scanner sc = new Scanner(System.in);
		while(true) {
			System.out.println("请输入品牌：");
			String brand = sc.next();
			System.out.println("请输入尺寸：");
			double size = sc.nextDouble();
			System.out.println("请输入价格：");
			double price = sc.nextDouble();
			System.out.println("请输入数量：");
			int count = sc.nextInt();

			Goods g = new Goods();
			g.brand = brand;
			g.size = size;
			g.price = price;
			g.count = count;
			array.add(g);
			System.out.println("添加成功");
			System.out.println("是否继续输入(1为继续输入0为结束输入)");
			int number = sc.nextInt();
			if(number==0)
				return;
		}
	}
	//功能3：修改商品
	public static void updateGoods(ArrayList<Goods> array) {
		Scanner sc = new Scanner(System.in);
		while(true) {
			System.out.println("请输入要修改的商品的序号：");
			int index= sc.nextInt()-1;
			Goods g = array.get(index);
			System.out.println("请输入品牌：");
			String brand = sc.next();
			g.brand = brand;

			System.out.println("请输入尺寸：");
			double size = sc.nextDouble();
			g.size = size;	

			System.out.println("请输入价格：");
			double price = sc.nextDouble();
			g.price = price;

			System.out.println("请输入价格：");
			int count = sc.nextInt();
			g.count = count;
			System.out.println("修改成功");
			System.out.println("是否继续输入(1为继续输入0为结束输入)");
			int number = sc.nextInt();
			if(number==0)
				return;
		}
	}
	//功能4：删除商品
	public static void deleteGoods(ArrayList<Goods> array) {
		Scanner sc = new Scanner(System.in);
		System.out.println("请输入要删除的序号：");
		int num = sc.nextInt()-1;
		array.remove(num);
		System.out.println("删除成功");
	}
}