期末作业

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<Fruit> list = new ArrayList<Fruit>();

 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:

  print(list);

  break;

  case 2:

  buy(list);

  break;

  case 3:

  checkOut(list);

  break;

  case 4:

  return;

  default:

  System.out.println("你输入的操作有误!");

  }

  

 }

  

 }

  

 private void checkOut(ArrayList<Fruit> 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");

 }

   

 for (int i = 0; i < list.size(); i++) {

  Fruit f = list.get(i);

  f.setNumber(0);

 }

 }

  

 public void buy(ArrayList<Fruit> 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");

  }

  }

  

 }

  

 }

  

 public void check(ArrayList<Fruit> 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<Fruit> 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());

 }

 }

}