线程中消费者生产者的实例代码(synchronized关键字)

http://www.cnblogs.com/DreamDrive/p/6204665.html  这个是用Lock类实现的.

场景:

厨师类:

 import java.util.List;
 import java.util.Random;
 import java.util.concurrent.TimeUnit;

 public class Cook implements Runnable {

     private List<Food> foods;
     private static int num = 1;
     private static final int MAXSIZE = 1;

     public List<Food> getFoods() {
         return foods;
     }

     public void setFoods(List<Food> foods) {
         this.foods = foods;
     }

     public Cook(List<Food> foods) {
         this.foods = foods;
     }

     public Cook() {
     }

     public void produce() {
         while (true) {
             synchronized (SaleWindow.class) {
                 if (foods.size() < MAXSIZE) {//卖饭的桌子上饭总有 一定的容量限制.
                     Food food = new Food((num++) + "");
                     foods.add(food);
                     System.out.println(Thread.currentThread().getName()
                             + " ：做好 " + food.getId() + " 号饭了");
                     Random ran = new Random();
                     int i = ran.nextInt(300);
                     try {
                         TimeUnit.MILLISECONDS.sleep(i);
                     } catch (InterruptedException e) {
                         e.printStackTrace();
                     }

                     //SaleWindow.class.notify();
                     SaleWindow.class.notifyAll();
                 } else {
                     System.out.println(Thread.currentThread().getName()
                             + " :桌子放满了。窗口赶紧卖，我休息了。。。");

                     try {
                         SaleWindow.class.wait();
                     } catch (InterruptedException e) {
                         e.printStackTrace();
                     }
                 }
             }
         }
     }

     @Override
     public void run() {
         produce();
     }
 }

食物类:

 public class Food {

     private String id;

     public Food(String id) {
         this.id = id;
     }

     public String getId() {
         return id;
     }

     public void setId(String id) {
         this.id = id;
     }

 }

卖饭窗口类:

 import java.util.List;
 import java.util.Random;
 import java.util.concurrent.TimeUnit;

 public class SaleWindow implements Runnable {

     private List<Food> foods;

     public List<Food> getFoods() {
         return foods;
     }

     public void setFoods(List<Food> foods) {
         this.foods = foods;
     }

     public SaleWindow(List<Food> foods) {
         this.foods = foods;
     }

     public SaleWindow() {
     }

     public  void sale() {
         while (true) {
             synchronized (SaleWindow.class) {
                 if (foods.size() > 0) {
                     try {
                         Food food = foods.get(0);
                         System.out.println(Thread.currentThread().getName()
                                 + ": 卖出了 " + food.getId() + " 号饭...");
                         Random ran = new Random();
                         int i = ran.nextInt(300);

                         TimeUnit.MILLISECONDS.sleep(i);
                         foods.remove(0);
                         //SaleWindow.class.notify();//随机唤醒一条等待的线程
                         SaleWindow.class.notifyAll();//唤醒所有等待的线程
                     } catch (InterruptedException e) {
                         e.printStackTrace();
                     }
                 }else{
                     System.out.println(Thread.currentThread().getName()+":饭买完了。厨师赶紧做，我休息了。。。");
                     try {
                         SaleWindow.class.wait();
                     } catch (InterruptedException e) {
                         e.printStackTrace();
                     }

                 }
             }
         }
     }

     @Override
     public void run() {
         sale();
     }

 }

测试类:

 import java.util.ArrayList;
 import java.util.List;

 public class Test {

     public static void main(String[] args) {

         List<Food> foods = new ArrayList<Food>();
         for (int i = 0; i < 4; i++) {//4个厨师 生产
             new Thread(new Cook(foods),"Cook"+(i+1)).start();
         }
         for (int i = 0; i < 3; i++) {//3个窗口 消费
             new Thread(new SaleWindow(foods),"sale"+(i+1)).start();
         }
     }
 }