---------------------- android培訓、java培訓、期待與您交流！ ----------------------

? ?通過張老師的交通燈的例子我認識到了很多：首先是要結合現實生活，明白交通燈的的邏輯，說實話在沒聽老師的課之前我真不知道交通燈的具體邏輯，其次認識到了畫圖的重要性，單靠想，自己想一會就把自己繞進去了，畫圖無疑是解決問題非常好的方法。 再次學到了面向對象的設計技巧。好了，下面來看這道題。

? 1、對象設計：設計一個Road對象操作

設計一個Road類

思路：1.創建一個單線程，模擬車子出現的過程、

2.檢查是否為綠燈。

 1 public class Road {
 2     private List<String> vechicles = new ArrayList<String>();
 3     
 4     private String name =null;
 5     public Road(String name){
 6         this.name = name;
 7         
 8         //模擬車輛不斷隨機上路的過程        
 9         ExecutorService pool = Executors.newSingleThreadExecutor();
10         pool.execute(new Runnable(){
11             public void run(){
12                 for(int i=1;i<1000;i++){
13                     try {
14                         Thread.sleep((new Random().nextInt(10) + 1) * 1000);
15                     } catch (InterruptedException e) {
16                         e.printStackTrace();
17                     }
18                     vechicles.add(Road.this.name + "_" + i);
19                 }                
20             }
21             
22         });
23         
25         ScheduledExecutorService timer =  Executors.newScheduledThreadPool(1);
26         timer.scheduleAtFixedRate(
27                 new Runnable(){
28                     public void run(){
29                         if(vechicles.size()>0){
30                             boolean lighted = Lamp.valueOf(Road.this.name).isLighted();
31                             if(lighted){
32                                 System.out.println(vechicles.remove(0) + " is traversing !");
33                             }
34                         }
35                         
36                     }
37                 },
38                 1,
39                 1,
40                 TimeUnit.SECONDS);
41         
42     }
43 }

?

燈一共有十二種情況和路情況一樣 定義燈的枚舉?

枚舉的value方法。

package traffic;public enum Lamp {S2N("N2S","S2W",false),S2W("N2E","E2N",false),E2W("W2E","E2S",false),E2S("W2N","W2S",false),N2S(null,null,false),N2E(null,null,false),W2E(null,null,false),W2N(null,null,false),S2E(null,null,false),E2N(null,null,false),N2W(null,null,false),W2S(null,null,false);private boolean lighted;//對應的燈private String opposite;//下一個燈private String next;private Lamp(String opposite,String next,boolean lighted){this.opposite =opposite;this.next=next;this.lighted=lighted;}private Lamp(){}public boolean isLighted(){return lighted;}public void light(){this.lighted=true;if(opposite!=null){Lamp.valueOf(opposite).lighted=true;System.out.println(name() + " lamp is green，下面總共應該有6個方向能看到汽車穿過！");}}public Lamp blackOut(){this.lighted =false;if(opposite!=null){Lamp.valueOf(opposite).lighted=false;}Lamp nextLight =Lamp.valueOf(next);System.out.println("綠燈從" + name() + "-------->切換為" + next);    if(next!=null)nextLight.lighted=true;return nextLight;}}

定義燈的控制類

package traffic;import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;public class LampController {private Lamp currentLamp;public LampController(){currentLamp =Lamp.S2N;currentLamp.light();ScheduledExecutorService timer = Executors.newScheduledThreadPool(1);timer.scheduleAtFixedRate(new Runnable(){public void run(){LampController.this.currentLamp =currentLamp.blackOut();}}, 10, 10, TimeUnit.SECONDS);}}

最后是控制的主類

package traffic;public class MainClass {public static void main(String[] args){String[] directions ={"S2N","S2W","E2W","E2S","N2S","N2E","W2E","W2N","S2E","E2N","N2W","W2S"};for(String direction:directions){new Road(direction);}new LampController();}}

總結：枚舉的知識環節薄弱，有待加強。及時學習新知識。

---------------------- android培訓、java培訓、期待與您交流！ ---------------------- 詳細請查看：http://edu.csdn.net/heima

轉載于:https://www.cnblogs.com/malinkang1989/archive/2012/06/21/2557841.html

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