java 之 面试题-银行业务调度

模拟实现银行业务调度系统逻辑，具体需求如下：

银行内有6个业务窗口，1 - 4号窗口为普通窗口，5号窗口为快速窗口，6号窗口为VIP窗口。

有三种对应类型的客户：VIP客户，普通客户，快速客户（办理如交水电费、电话费之类业务的客户）。

异步随机生成各种类型的客户，生成各类型用户的概率比例为：

        VIP客户 ：普通客户 ：快速客户  =  1 ：6 ：3。

客户办理业务所需时间有最大值和最小值，在该范围内随机设定每个VIP客户以及普通客户办理业务所需的时间，快速客户办理业务所需时间为最小值（提示：办理业务的过程可通过线程Sleep的方式模拟）。

各类型客户在其对应窗口按顺序依次办理业务。

当VIP（6号）窗口和快速业务（5号）窗口没有客户等待办理业务的时候，这两个窗口可以处理普通客户的业务，而一旦有对应的客户等待办理业务的时候，则优先处理对应客户的业务。

随机生成客户时间间隔以及业务办理时间最大值和最小值自定，可以设置。

不要求实现GUI，只考虑系统逻辑实现，可通过Log方式展现程序运行结果。

看了需求，就按着自己的想法开始做：

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import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.Enumeration; import java.util.LinkedList; import java.util.Random; import java.util.Vector; import java.util.concurrent.TimeUnit;   public class Test {     DateFormat date;       // 这个是限制概率,存放的是某个类型的客户     // 内部类不允许使用静态变量，只好放这里了     static int defaultCount = 0;     static int fastCount = 0;     static int VIPCount = 0;       public Test() {         date = new SimpleDateFormat("HH:mm:ss");     }       // 客户类，代表各种客户     public class Customer {           private String name;         // 客户类型 2,1,3分表代表,快速，vip，普通客户         private int type;         private LinkedList<Customer> window;           public void setWindow(LinkedList<Customer> window) {             this.window = window;         }           public LinkedList<Customer> getWindow() {             return window;         }           // 办理业务所需时间,秒         private int time;           public int getType() {             return type;         }           public int getTime() {             return time;         }           public void setName(String name) {             this.name = name;         }           public String getName() {             return name;         }           public Customer(int type) {             this.type = type;               Random r = new Random();               // 2是快速客户，1是vip客户，3是普通客户，这三个数是基数             // 随机一个办理业务的时间，根据客户类型算出所需时间，             // 原则的时间大小顺序是普通>VIP>快速客户             time = (this.type % 2 + this.type) * r.nextInt(4) + 5;         }       }       // 窗口类，代表了各个窗口等待容器     public class Window implements CustLinstener {         // 各个窗口容器         private LinkedList<Customer> VIP6;         private LinkedList<Customer> fast5;         // 这是个普通窗口容器         private ArrayList<LinkedList<Customer>> defaults124;         private LinkedList<Customer> default1;         private LinkedList<Customer> default2;         private LinkedList<Customer> default3;         private LinkedList<Customer> default4;           public LinkedList<Customer> getVIP6() {             return VIP6;         }           public LinkedList<Customer> getFast5() {             return fast5;         }           public LinkedList<Customer> getDefault1() {             return default1;         }           public LinkedList<Customer> getDefault2() {             return default2;         }           public LinkedList<Customer> getDefault3() {             return default3;         }           public LinkedList<Customer> getDefault4() {             return default4;         }           public Window() {             // 初始化各个窗口             default1 = new LinkedList<Customer>();             default2 = new LinkedList<Customer>();             default3 = new LinkedList<Customer>();             default4 = new LinkedList<Customer>();             defaults124 = new ArrayList<LinkedList<Customer>>();             defaults124.add(default1);             defaults124.add(default2);             defaults124.add(default3);             defaults124.add(default4);             fast5 = new LinkedList<Customer>();             VIP6 = new LinkedList<Customer>();         }           // 增加一个客户         public void addCustomer(Customer cu) {             if (cu.getType() == 2) {                 cu.setWindow(fast5);                 fast5.add(cu);                 System.out.println(date.format(new Date()) + "  --["                         + cu.getName() + "]号客户被加到了[快速窗口]队列并等待办理[快速业务]");             } else if (cu.getType() == 1) {                 cu.setWindow(VIP6);                 VIP6.add(cu);                 System.out.println(date.format(new Date()) + "  --["                         + cu.getName() + "]号客户被加到了[VIP窗口]队列并等待办理[VIP业务]");             } else {                   // 普通用户的话，按原则先推到人少的窗口                 int size = 0;                 for (int i = 1; i < 4; i++) {                     if (defaults124.get(i).size() < defaults124.get(size)                             .size())                         size = i;                 }                 defaults124.get(size).add(cu);                 System.out.println(date.format(new Date()) + "  --["                         + cu.getName() + "]号客户被加到了[普通窗口]队列并等待办理[普通业务]");               }         }           // 客户业务办理完毕，删除一个客户         public void removeCustomer(LinkedList<Customer> window) {             // 如果是快速窗口的业务，并且快速窗口没有人了，就从普通窗口调剂过去             if (window == fast5 && fast5.size() == 0) {                 // 首先判断所有普通窗口是不是都有人                 boolean usingAll = true;                 for (LinkedList<Customer> w : defaults124) {                     if (w.size() == 0)                         usingAll = false;                 }                   // 都是用了的话，就调剂                 if (usingAll) {                     // 首先取得是哪个普通窗口人最多                     int size = 0;                     // 前提条件是他们都有客户                       for (int i = 1; i < 5; i++) {                         if (defaults124.get(i).size() > defaults124.get(size)                                 .size())                             size = i;                     }                     // 将人数最多的窗口的下一个接受业务办理的客户已送到快速窗口                     Customer temp = defaults124.get(size).get(1);                     defaults124.get(size).remove(1);                       fast5.addLast(temp);                   } else {                     Customer c = window.peek();                     System.out.println(date.format(new Date()) + "  ["                             + c.getName() + "]号客户走人");                     window.poll();                   }             } else {                 Customer c = window.peek();                 System.out.println(date.format(new Date()) + "  ["                         + c.getName() + "]号客户走人");                 window.poll();             }           }           @Override         public void custEvent(CustEvent e) {             // TODO Auto-generated method stub             Customer cu = new Customer(e.getType());             cu.setName(e.getName());             addCustomer(cu);           }       }       // 业务员，就那几个个窗口的业务员     public class Officer {         private Window windows;         private LinkedList<Customer> default1;         private LinkedList<Customer> default2;         private LinkedList<Customer> default3;         private LinkedList<Customer> default4;         private LinkedList<Customer> fast5;         private LinkedList<Customer> vip6;           public Officer(Window w) {             windows = w;             default1 = w.getDefault1();             default2 = w.getDefault2();             default3 = w.getDefault3();             default4 = w.getDefault4();             fast5 = w.getFast5();             vip6 = w.getVIP6();         }           // 六个业务员开始工作         public void startWork() {               // 1号业务员工作             Thread t1 = new Thread(new Runnable() {                 @Override                 public void run() {                     // TODO Auto-generated method stub                     try {                         while (!Thread.interrupted()) {                             if (default1.size() > 1) {                                 doing(default1, "普通窗口①");                             }                         }                     } catch (InterruptedException e) {                         // TODO Auto-generated catch block                         e.printStackTrace();                     }                   }             });               // 2号业务员工作             Thread t2 = new Thread(new Runnable() {                 @Override                 public void run() {                     // TODO Auto-generated method stub                     try {                         while (!Thread.interrupted()) {                             if (default2.size() > 1) {                                 doing(default2, "普通窗口②");                               }                         }                     } catch (InterruptedException e) {                         // TODO Auto-generated catch block                         e.printStackTrace();                     }                   }             });               // 3号业务员工作             Thread t3 = new Thread(new Runnable() {                 @Override                 public void run() {                     // TODO Auto-generated method stub                     try {                         while (!Thread.interrupted()) {                             if (default3.size() > 1) {                                 doing(default3, "普通窗口③");                               }                         }                     } catch (InterruptedException e) {                         // TODO Auto-generated catch block                         e.printStackTrace();                     }                   }             });               // 4号业务员工作             Thread t4 = new Thread(new Runnable() {                 @Override                 public void run() {                     // TODO Auto-generated method stub                     try {                         while (!Thread.interrupted()) {                             if (default4.size() > 1) {                                 doing(default4, "普通窗口④");                               }                         }                     } catch (InterruptedException e) {                         // TODO Auto-generated catch block                         e.printStackTrace();                     }                   }             });               // 5号快速窗口业务员工作             Thread t5 = new Thread(new Runnable() {                 @Override                 public void run() {                     // TODO Auto-generated method stub                     try {                         while (!Thread.interrupted()) {                             if (fast5.size() > 1) {                                 doing(fast5, "快速窗口⑤");                               }                         }                     } catch (InterruptedException e) {                         // TODO Auto-generated catch block                         e.printStackTrace();                     }                   }             });               // 6号VIP窗口业务员工作             Thread t6 = new Thread(new Runnable() {                 @Override                 public void run() {                     // TODO Auto-generated method stub                     try {                         while (!Thread.interrupted()) {                             if (vip6.size() > 1) {                                 doing(vip6, "VIP窗口⑥");                               }                         }                     } catch (InterruptedException e) {                         // TODO Auto-generated catch block                         e.printStackTrace();                     }                   }             });               t1.setPriority(Thread.NORM_PRIORITY);             t2.setPriority(Thread.NORM_PRIORITY);             t3.setPriority(Thread.NORM_PRIORITY);             t4.setPriority(Thread.NORM_PRIORITY);             t5.setPriority(Thread.NORM_PRIORITY);             t6.setPriority(Thread.NORM_PRIORITY);               t1.start();             t2.start();             t3.start();             t4.start();             t5.start();             t6.start();           }           private void doing(LinkedList<Customer> window, String wn)                 throws InterruptedException {             Customer c = window.peek();             System.out.println(date.format(new Date()) + "  [" + c.getName()                     + "]号客户在[" + wn + "]办理业务，预计时间[" + c.getTime() + "]秒");             Thread.yield();             TimeUnit.SECONDS.sleep(c.getTime());             windows.removeCustomer(window);         }       }       // 这个类随机产生客户     public class GodKing implements Runnable {         // 事件         CustAdaper ca;           // 标示客户         private Integer number;         // 随机数种子         private Random random;           // 窗口         // private Window windows;           public GodKing(Window w) {             number = 100;             random = new Random();             // windows=w;             ca = new CustAdaper();           }           // 开始生成客户         @Override         public void run() {             // TODO Auto-generated method stub             try {                 Thread.currentThread().setPriority(Thread.MIN_PRIORITY);                 while (!Thread.interrupted()) {                       // 这里来实现VIP客户 ：普通客户 ：快速客户 = 1 ：6 ：3的比例                     int dtype = random.nextInt(3) + 1;                       // 快速业务客户与普通客户没有达到指定比例，但vip达到了，就避免类型为vip                     if (VIPCount == 1 && fastCount < 3 && defaultCount < 6) {                         do {                             dtype = random.nextInt(3) + 1;                         } while (dtype == 1);                         // 快速客户与vip客户已经是指定比例，普通的还不是                     } else if (VIPCount == 1 && fastCount == 3                             && defaultCount < 6) {                         do {                             dtype = random.nextInt(3) + 1;                         } while (dtype == 1 || dtype == 2);                     } else {                         // 已经是指定比例了计数器归零                         VIPCount = 0;                         fastCount = 0;                         defaultCount = 0;                     }                       switch (dtype) {                     case 1:                         VIPCount++;                     case 2:                         fastCount++;                     case 3:                         defaultCount++;                     }                     // Customer c=new Customer(dtype);                     // c.setName(number.toString());                     // windows.addCustomer(c);                     number++;                     CustEvent e = new CustEvent();                     e.setName(number.toString());                     e.setType(dtype);                     ca.notifyCustEvent(e);                     // 最多10秒钟来一个人                     Thread.yield();                     TimeUnit.SECONDS.sleep(random.nextInt(10));                   }             } catch (InterruptedException e) {                 // TODO Auto-generated catch block                 e.printStackTrace();             }         }           public void addCustEventListener(CustLinstener cu) {             ca.addCustListener(cu);         }       }       public static void main(String[] args) {         Test t = new Test();         Window windows = t.new Window();         Officer officers = t.new Officer(windows);         GodKing god = t.new GodKing(windows);         god.addCustEventListener(windows);           officers.startWork();         god.run();       }       // 新客户事件     public class CustEvent {         private int type;         private String name;           public int getType() {             return type;         }           public void setType(int type) {             this.type = type;         }           public String getName() {             return name;         }           public void setName(String name) {             this.name = name;         }     }       public interface CustLinstener {         public void custEvent(CustEvent e);     }       public class CustAdaper {         private Vector<CustLinstener> events = new Vector<CustLinstener>();         CustLinstener cu;           public void addCustListener(CustLinstener wc) {             events.addElement(wc);         }           public void notifyCustEvent(CustEvent e) {             Enumeration<CustLinstener> listener = events.elements();             while (listener.hasMoreElements()) {                 cu = listener.nextElement();                 cu.custEvent(e);             }         }     }   }

这几百行的，居然让Js着色解析时栈溢出，ie6不行啊。。。

对于一个自己学习测试用的东西，喜欢写成单类单文件，这样方便复制粘贴直接编译，内部类比较多。

写完后，发现在前5个到前6个模拟客户，业务实现逻辑总是工作不正常，整整花了半天多时间研究为神马，起初是没打算用事件的，但后来考虑到锁的问题，想想加上事件机制会不会解决，结果呢还是没有解决，开发模式却变得不伦不类，把线程优先级别改改呢，最高的模式下，居然电脑死机了。

再想想，是不是线程过多了，改成了单独两个线程，还是有点问题，最后再仔细看看《thinking in java》，并发确实是个很难说的东西，再加上时间片本来分配的问题，那几个线程怎么可能确保同步呢。。。。

最后，看了下张老师的代码，。。。。。居然和我的路子不一样，我想的过于细了。结果给自己造了这么多绊子。就先这样吧，改天再深入研究研究并发。