自动售货系统源码

这里给出的是华为公司在线软件训练与测试平台（网址：career-oj.huawei.com）上一道编程挑战题，在其系统中查看名为：自动收获系统的题目可以找到该题的详细信息。

view plaincopy to clipboardprint?import java.util.HashSet;  import java.util.Scanner;  import java.util.Stack;    public class Main {      class Goods {          public String name;          public int price;          public int count;          public Goods(String name,int price) {              this.name = name;              this.price = price;              count = 0;                        }          public String print() {              return new String(name + " " + price + " " + count);          }          public int getNameOrder() {              return Integer.parseInt(name.substring(1));          }      }            class GoodsAll {          public Goods A1 = new Goods("A1",2);          public Goods A2 = new Goods("A2",3);          public Goods A3 = new Goods("A3",4);          public Goods A4 = new Goods("A4",5);          public Goods A5 = new Goods("A5",8);          public Goods A6 = new Goods("A6",6);                public Goods getA(int i) {              switch(i) {              case 1:                  return A1;              case 2:                  return A2;              case 3:                  return A3;              case 4:                  return A4;              case 5:                  return A5;              case 6:                  return A6;              default:                  return null;              }          }                    public String print() {              Goods[] goods = new Goods[] {A1,A2,A3,A4,A5,A6};              Goods tmp = null;              int i,j;              for (i = 0; i < goods.length - 1; i++) {                  for (j = i + 1; j < goods.length; j++) {                      if (goods[i].count < goods[j].count) {                          tmp = goods[i];                          goods[i] = goods[j];                          goods[j] = tmp;                      } else if (goods[i].count == goods[j].count) {                          if (goods[i].getNameOrder() > goods[j].getNameOrder()) {                              tmp = goods[i];                              goods[i] = goods[j];                              goods[j] = tmp;                          }                      }                  }              }              StringBuilder sb = new StringBuilder();              for (i = 0; i < goods.length; i++) {                  sb.append(goods[i].print() + "\r\n");              }              return sb.toString();          }                    public boolean isEmpty() {              int sum = 0;              for (int i = 1; i <= 6; i++) {                  sum += getA(i).count;              }              if (sum == 0) {                  return true;              }else {                  return false;              }          }      }            class Moneys {          //按次序依次存储10、5、2、1的信息          int[] change = new int[4];          //向存钱罐中增加钱          public String addMoney(int m) {              boolean ok = true;              StringBuilder sb = new StringBuilder();              if (m != 1 && m != 2 && m != 5 && m != 10) {                  sb.append("E002:Denomination error\r\n");                  ok = false;                  return sb.toString();              }                            if (m > 2 && m > change[3] + change[2] * 2) {                  sb.append("E003:Change is not enough, pay fail\r\n");                  ok = false;                  return sb.toString();              }              if (m > 10) {                  sb.append("E004:Pay the balance is beyond the scope biggest\r\n");                  ok = false;                  return sb.toString();              }              if (goodsAll.isEmpty()) {                  sb.append("E005:All the goods sold out\r\n");                  ok = false;                  return sb.toString();              }              if(ok) {                  switch(m) {                  case 1:                      change[3]++;                      break;                  case 2:                      change[2]++;                      break;                  case 5:                      change[1]++;                      break;                  case 10:                      change[0]++;                      break;                  default:                          break;                  }                  consumer.balance += m;                  sb.append("S002:Pay success,balance=" + consumer.balance + "\r\n");              }              return sb.toString();          }                    //找钱          public String exchange(int m) {              int mtmp = m;              //将所有零钱压栈，将最小的先入栈              Stack<Integer> stackChange = new Stack<Integer>();              //新建一个堆栈用来存储找零结果              Stack<Integer> stackResult = new Stack<Integer>();              int i,j,k;              int one, two, five, ten;  //          for (i = 0; i < change[3]; i++) {  //              stackChange.push(1);  //          }  //          for (i = 0; i < change[2]; i++) {  //              stackChange.push(2);  //          }  //          for (i = 0; i < change[1]; i++) {  //              stackChange.push(5);  //          }  //          for (i = 0; i < change[0]; i++) {  //              stackChange.push(10);  //          }  //            //          while(!stackChange.isEmpty()) {  //              int test = stackChange.pop();  //              if (m >= test) {  //                  m -= test;  //                  stackResult.push(test);  //              }  //          }                            for (i = 0; i <= 3; i++) {                  for(j = 3; j >= i; j-- ) {                      for (k = 0; k < change[j]; k++) {                          if (j == 3) {                              stackChange.push(1);                          } else if(j == 2) {                              stackChange.push(2);                          } else if(j == 1) {                              stackChange.push(5);                          } else {                              stackChange.push(10);                          }                      }                  }                  while(!stackChange.isEmpty()) {                      int test = stackChange.pop();                      if (m >= test) {                          m -= test;                          stackResult.push(test);                      }                     }                  if (m == 0) {                      break;                  } else {                      m = mtmp;                      stackChange.clear();                      stackResult.clear();                  }              }                            //将找零结果存储在这四个Int变量中。              one = two = five = ten = 0;              while(!stackResult.isEmpty()) {                  int result = stackResult.pop();                  switch(result) {                  case 1:                      one++;                      break;                  case 2:                      two++;                      break;                  case 5:                      five++;                      break;                  case 10:                      ten++;                      break;                  default:                  }              }                            //更新存钱罐              change[0] -= ten;              change[1] -= five;              change[2] -= two;              change[3] -= one;              //消费余额清零              consumer.balance = 0;              //生成找钱信息              StringBuilder sb = new StringBuilder();              sb.append("1 yuan coin number=" + one + "\r\n");              sb.append("2 yuan coin number=" + two + "\r\n");              sb.append("5 yuan coin number=" + five + "\r\n");              sb.append("10 yuan coin number=" + ten  + "\r\n");              return sb.toString();          }                    //打印钱盒信息          String print() {              StringBuilder sb = new StringBuilder();              sb.append("1 yuan coin number=" + change[3] + "\r\n");              sb.append("2 yuan coin number=" + change[2] + "\r\n");              sb.append("5 yuan coin number=" + change[1] + "\r\n");              sb.append("10 yuan coin number=" + change[0] + "\r\n");              return sb.toString();          }      }            //消费者类      class Consumer {          int balance = 0;          //str is like 'A1' or 'A3'          public String buy(String str) {              StringBuilder sb = new StringBuilder();              boolean ok = true;              HashSet<String> names = new HashSet<String>();              names.add("A1");              names.add("A2");              names.add("A3");              names.add("A4");              names.add("A5");              names.add("A6");              if (!names.contains(str)) {                  sb.append("E006:Goods does not exist");                  ok = false;                  return sb.toString();              }              int goodsId = Integer.parseInt(str.substring(1));              if (goodsAll.getA(goodsId).count == 0) {                  sb.append("E007:The goods sold out\r\n");                  ok = false;                  return sb.toString();              }              if (consumer.balance < goodsAll.getA(goodsId).price) {                  sb.append("E008:Lack of balance\r\n");                  ok =false;                  return sb.toString();              }              if (ok) {                  consumer.balance -= goodsAll.getA(goodsId).price;                  goodsAll.getA(goodsId).count -- ;                  sb.append("S003:Buy success,balance=" + consumer.balance + "\r\n");              }              return sb.toString();          }      }            //初始化      public String reset(String str) {          String[] strOne = str.split(" ");          String[] strA = strOne[1].split("-");          String[] strMoney = strOne[2].split("-");          int i;          for (i = 0; i < strA.length; i++) {              goodsAll.getA(i + 1).count = Integer.parseInt(strA[i]);          }          for (i = 0; i < strMoney.length; i++) {              moneys.change[3 - i] = Integer.parseInt(strMoney[i]);          }          return new String("S001:Initialization is successful");      }            public String pay(String str) {          String s = str.substring(2);          return moneys.addMoney(Integer.parseInt(s));      }            public String buy(String str) {          return consumer.buy(str.substring(2));      }            public String change(String str) {          if (consumer.balance > 0) {              return moneys.exchange(consumer.balance);          } else {              return new String("E009:Work failure");          }      }            public String query(String str) {          if (!str.equals("q 0") && !str.equals("q 1")) {              return new String("E010:Parameter error");          } else {              int queryId = Integer.parseInt(str.substring(2));              if (queryId == 0) {                  return goodsAll.print();              } else {                  return moneys.print();              }          }      }            //////////////////////////////////////////////////////////      public GoodsAll getGoodsAll() {          return new GoodsAll();      }      public Moneys getMoneys() {          return new Moneys();      }      public Consumer getConsumer() {          return new Consumer();      }            public static Main main = new Main();      public static Main.Consumer consumer = main.getConsumer();      public static Main.GoodsAll goodsAll = main.getGoodsAll();      public static Main.Moneys moneys = main.getMoneys();      ////////////////////////////////////////////////////////////      public static void main(String[] args) {  //      Main main = new Main();  //      Main.Consumer consumer = main.getConsumer();  //      Main.GoodsAll goodsAll = main.getGoodsAll();  //      Main.Moneys moneys = main.getMoneys();                    Scanner sca = new Scanner(System.in);          String order = sca.nextLine();          //while(!((order = sca.nextLine()).equals("0"))){                    String[] str = order.split(";");          for (String s:str) {              String title = s.substring(0,1);              switch(title) {              case "r":                  System.out.println(main.reset(s));                  //System.out.print(goodsAll.print());                   //System.out.print(moneys.print());                  break;              case "p":                  System.out.print(main.pay(s));                  break;              case "b":                  System.out.print(main.buy(s));                  break;              case "c":                  System.out.print(main.change(s));                  break;              case "q":                  System.out.print(main.query(s));                  break;              default:                                }          }          //}      }  }  

需要注意的是：在给出输出信息的时候，一定要按照题目所给的格式来编写，比如给出找钱信息的时候 1 yuan coin number=X,这句话中每一个单词之间都要用空格隔开，我曾经因为1和yuan之间没有用空格隔开而导致测试结果出错，所以如果一定要追求答题的准确，就必须注意这些细节性的东西。

代码质量不高，仅仅能完成功能。