(学习java)水果超市管理系统

代码地址：码云

水果超市管理系统（简化版）: https://gitee.com/scorpio0zry/Fruit

水果超市管理系统 : https://gitee.com/scorpio0zry/FruitManager

首先建立水果类的界面

public class Fruit {
	//定义ID
	private String id;
	//定义名称
	private String name;
	//定义价格
	private int price;
	//定义单位
	private String unit;
	
	//定义数量
	private int number;
	public Fruit(String id, String name, int price, String unit) {
		super();
		this.id = id;
		this.name = name;
		this.price = price;
		this.unit = unit;
	}
	public Fruit() {
		super();
		// TODO Auto-generated constructor stub
	}
	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 int getPrice() {
		return price;
	}
	public void setPrice(int price) {
		this.price = price;
	}
	public String getUnit() {
		return unit;
	}
	public void setUnit(String unit) {
		this.unit = unit;
	}
	public int getNumber() {
		return number;
	}
	public void setNumber(int number) {
		this.number = number;
	}
	
	//获取价格
	public int getMoney(){
		return price * number;
	}
	
}

水果超市的界面

 

import java.io.IOException;
import java.util.Scanner;

public class FruitTest {
	public static void main(String[] args) throws IOException {
		Scanner sc = new Scanner(System.in);
		Shopper shopper = new Shopper();
		Manager manager = new Manager();
		
		while(true){
			System.out.println( "                               欢迎光临水果系统");
			System.out.println("请输入你的角色:(1.顾客        2.管理员        3.退出)");
			int choice = sc.nextInt();
			switch(choice){
			case 1:
				//顾客
				shopper.shop();
				break;
			case 2:
				//管理员
				manager.manager();
				break;
			case 3:
				System.exit(0);
			default:
				System.out.println("你的输入有误!");
			}
		}
		
	}
}

顾客类

 

 

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

public class Shopper {
	public void shop() throws IOException {
		Scanner sc = new Scanner(System.in);
		ArrayList list = new ArrayList();
		check(list);
		while (true) {
			System.out
					.println("                                       欢迎光临水果系统");
			System.out
					.println("请输入你的操作:(1.查看水果        2.购买水果        3.结账         4.退出)");
			int choice = sc.nextInt();
			switch (choice) {
			case 1:
				// 查看水果
				print(list);
				break;
			case 2:
				// 购买水果
				buy(list);
				break;
			case 3:
				// 结账
				checkOut(list);
				break;
			case 4:
				// 退出
				return;
			default:
				System.out.println("你输入的操作有误!");
			}

		}

	}
	
	//结账
	private void checkOut(ArrayList list) {
		int sum = 0;
		for (int i = 0; i < list.size(); i++) {
			Fruit f = list.get(i);
			sum += f.getMoney();
		}
		
		if(sum>200){
			int newSum = (int) (sum * 0.9);
			System.out.println("金额：" + sum+ "元, 优惠价格："+ newSum+"元");
		}else{
			System.out.println("金额：" + sum+"元");
		}
		
		//结完账后，将数量清0
		for (int i = 0; i < list.size(); i++) {
			Fruit f = list.get(i);
			f.setNumber(0);
		}
	}

	// 购买水果
	public void buy(ArrayList list) throws IOException {
		Scanner sc1 = new Scanner(System.in);
		Scanner sc2 = new Scanner(System.in);
		print(list);
		while (true) {		
			System.out.println("购买超过200元，享受九折优惠！");
			System.out.println("请输入想要购买的水果的ID：(如果不想购买，请输入-1退出)");
			String id = sc1.nextLine();
			if ("-1".equals(id)) {
				System.out.println("购买已结束，请去结账 ");
				return;
			} else {
				boolean flag = false;
				for (int i = 0; i < list.size(); i++) {
					Fruit f = list.get(i);
					if(f.getId().equals(id)) {
						System.out.println("请输入购买" + f.getName() + "数量： ");
						int num = sc2.nextInt();
						f.setNumber(num);
						flag = true;
					}
				}
				if(!flag){
					System.out.println("你输入的水果ID不正确,请重新输入");
				}
			}

		}

	}

	// 查看水果
	public void check(ArrayList list) throws IOException {
		BufferedReader br = new BufferedReader(new FileReader("fruit.txt"));
		String line;
		while ((line = br.readLine()) != null) {
			String[] str = line.split(" ");
			Fruit f = new Fruit(str[0], str[1], Integer.parseInt(str[2]),
					str[3]);
			list.add(f);
		}
		br.close();
	}

	public void print(ArrayList list) {
		System.out.println("ID\t水果\t价格\t单位");
		for (int i = 0; i < list.size(); i++) {
			Fruit f = list.get(i);
			System.out.println(f.getId() + "\t" + f.getName() + "\t"
					+ f.getPrice() + "\t" + f.getUnit());
		}
	}
}

管理员类

 

 

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

public class Manager {

	public void manager() throws IOException {
		if (load()) {		
			Scanner sc = new Scanner(System.in);
			while (true) {
				ArrayList list = new ArrayList();
				check(list);
				System.out
						.println("请输入您的操作： (1.查看水果种类         2.增加水果种类        3.修改水果种类      4.删除水果种类         5退出)");
				int choice = sc.nextInt();
				switch (choice) {
				case 1:
					// 查看水果种类
					print(list);
					break;
				case 2:
					// 增加水果种类
					addFruit(list);
					break;
				case 3:
					// 修改水果种类
					reverse(list);
					break;
				case 4:
					// 删除水果种类
					remove(list);
					break;
				case 5:
					// 退出
					return;
				default:
					System.out.println("你输入的操作有误!");
					break;
				}
			}

		} else {
			return;
		}
	}
	
	public void remove(ArrayList list) throws IOException {
		Scanner sc = new Scanner(System.in);
		print(list);
		System.out.println("请输入要删除的水果ID: ");
		String id = sc.nextLine();
		for (int i = 0; i < list.size(); i++) {
			Fruit f = list.get(i);
			if(f.getId().equals(id)){
				list.remove(i);
				write(list);
				System.out.println("删除成功");
				return;
			}
		}
		System.out.println("找不到要删除的水果ID!");
	}

	//修改水果
	public void reverse(ArrayList list) throws IOException {
		Scanner sc1 = new Scanner(System.in);
		Scanner sc2 = new Scanner(System.in);
		print(list);
		System.out.println("请输入要修改的水果ID: ");
		String id = sc1.nextLine();
		for (int i = 0; i < list.size(); i++) {
			Fruit f = list.get(i);
			if(f.getId().equals(id)){
				System.out.println("请输入水果的名称: ");
				String name = sc1.nextLine();
				System.out.println("请输入水果的价格: ");
				int price = sc2.nextInt();
				System.out.println("请输入水果的单位: ");
				String unit = sc1.nextLine();
				
				f.setName(name);
				f.setPrice(price);
				f.setUnit(unit);
				
				write(list);
				System.out.println("修改成功");
				return;
			}
		}
		System.out.println("找不到要修改的水果ID!");
		
			
	}

	//增加水果
	public void addFruit(ArrayList list) throws IOException {
		Scanner sc1 = new Scanner(System.in);
		Scanner sc2 = new Scanner(System.in);
		print(list);
		System.out.println("请输入要增加水果的ID: ");
		String id = sc1.nextLine();
		for (int i = 0; i < list.size(); i++) {
			Fruit f = list.get(i);
			if(f.getId().equals(id)){
				System.out.println("水果ID名重复!");
				return;
			}
		}
		System.out.println("请输入水果的名字: ");
		String name = sc1.nextLine();
		System.out.println("请输入水果的价格: ");
		int price = sc2.nextInt();
		System.out.println("请输入水果的单位: ");
		String unit = sc1.nextLine();
		
		Fruit f = new Fruit(id, name, price, unit);
		list.add(f);
		
		write(list);
		System.out.println("增加成功");
		
	}
	//写入新加的种类
	private void write(ArrayList list) throws IOException {
		BufferedWriter bw = new BufferedWriter(new FileWriter("fruit.txt"));
		for (int i = 0; i < list.size(); i++) {
			Fruit f = list.get(i);
			bw.write(f.getId()+" " + f.getName() + " " + f.getPrice() + " " + f.getUnit());
			bw.newLine();
		}
		bw.close();
	}
	
	
	public void print(ArrayList list) {
		System.out.println("ID\t水果\t价格\t单位");
		for (int i = 0; i < list.size(); i++) {
			Fruit f = list.get(i);
			System.out.println(f.getId() + "\t" + f.getName() + "\t"
					+ f.getPrice() + "\t" + f.getUnit());
		}
	}

	// 查看水果
	public void check(ArrayList list) throws IOException {
		BufferedReader br = new BufferedReader(new FileReader("fruit.txt"));
		String line;
		while ((line = br.readLine()) != null) {
			String[] str = line.split(" ");
			Fruit f = new Fruit(str[0], str[1], Integer.parseInt(str[2]),
					str[3]);
			list.add(f);
		}
		br.close();
	}

	// 登陆系统
	public boolean load() throws FileNotFoundException, IOException {
		Scanner sc = new Scanner(System.in);

		System.out.println("请输入用户名： ");
		String username = sc.nextLine();
		System.out.println("请输入密码： ");
		String password = sc.nextLine();
		BufferedReader br = new BufferedReader(new FileReader("admin.txt"));
		String line = br.readLine();
		String[] str = line.split(",");
		if (str[0].equals(username) && str[1].equals(password)) {
			System.out.println("欢迎您进入水果管理系统： " + username);
			return true;
		} else {
			System.out.println("你的用户名或密码输入不正确，无法进入管理系统");
			return false;
		}
	}
}