演示一个阻塞队列的使用
1 public class BlockingQueueTest 2 { 3 public static void main(String[] args) 4 { 5 //创建一个包含三个元素的阻塞队列 6 final BlockingQueue<Integer> queue = new ArrayBlockingQueue<Integer>(3); 7 for (int i = 0; i < 2; i++) 8 { 9 new Thread(new Runnable() 10 { 11 @Override 12 public void run() 13 { 14 while(true){ 15 try 16 { 17 Thread.sleep(1000); 18 System.out.println("线程"+Thread.currentThread().getName()+" 准备放数据了"); 19 queue.put(new Random().nextInt(100)); 20 System.out.println("线程"+Thread.currentThread().getName()+" 已经放完数据了,目前队列有"+queue.size()+"个数据"); 21 } catch (InterruptedException e) 22 { 23 e.printStackTrace(); 24 } 25 } 26 } 27 }).start(); 28 29 } 30 31 new Thread(new Runnable() 32 { 33 @Override 34 public void run() 35 { 36 while(true){ 37 try 38 { 39 //将此处的睡眠时间改为200和2000 分别观察结果 40 Thread.sleep(2000); 41 System.out.println("线程"+Thread.currentThread().getName()+" 准备取数据了"); 42 queue.take(); 43 System.out.println("线程"+Thread.currentThread().getName()+" 已经取完数据了,目前队列有"+queue.size()+"个数据"); 44 } catch (InterruptedException e) 45 { 46 e.printStackTrace(); 47 } 48 } 49 } 50 }).start(); 51 } 52 }
部分运行结果如下，
线程Thread-1 准备放数据了 线程Thread-0 准备放数据了 线程Thread-1 已经放完数据了,目前队列有1个数据 线程Thread-0 已经放完数据了,目前队列有2个数据 线程Thread-2 准备取数据了 线程Thread-2 已经取完数据了,目前队列有1个数据 线程Thread-1 准备放数据了 线程Thread-0 准备放数据了 线程Thread-1 已经放完数据了,目前队列有2个数据 线程Thread-0 已经放完数据了,目前队列有3个数据 线程Thread-1 准备放数据了 线程Thread-0 准备放数据了 线程Thread-2 准备取数据了 线程Thread-2 已经取完数据了,目前队列有2个数据 线程Thread-1 已经放完数据了,目前队列有3个数据 线程Thread-1 准备放数据了 线程Thread-2 准备取数据了 线程Thread-2 已经取完数据了,目前队列有2个数据 线程Thread-0 已经放完数据了,目前队列有3个数据 线程Thread-0 准备放数据了 线程Thread-2 准备取数据了 线程Thread-2 已经取完数据了,目前队列有2个数据 线程Thread-1 已经放完数据了,目前队列有3个数据 线程Thread-1 准备放数据了 线程Thread-2 准备取数据了 线程Thread-2 已经取完数据了,目前队列有2个数据 线程Thread-0 已经放完数据了,目前队列有3个数据 线程Thread-0 准备放数据了
* 面试题
* 需求:
* 子线程循环输出10次
* 接着主线程循环输出100次
* 接着又回到子线程执行10次
* 再回到主线程执行100次
* 如此往复50次 请写出程序
* 此处使用阻塞队列来实现
1 public class BlockingQueueCommunication 2 { 3 public static void main(String[] args) throws InterruptedException 4 { 5 final Core core = new Core(); 6 //子线程 7 new Thread( 8 new Runnable() 9 { 10 @Override 11 public void run() 12 { 13 for (int i = 1; i <= 50;i++) 14 { 15 core.SubMethod(i); 16 } 17 } 18 } 19 ).start(); 20 21 //主线程 22 for (int i = 1; i <= 50; i++) 23 { 24 core.MainMethod(i); 25 } 26 } 27 28 /** 29 * 创建一个静态的类 30 * 将核心的业务逻辑的方法放在这里 31 * 体现了高内聚的特点 32 * @author huang.jf 33 * 34 */ 35 static class Core{ 36 //创建两个阻塞队列 都只能装一个元素 37 //实现的效果就是q1存，q2取,q2存,q1取 38 //用两个具有一个空间的队列来实现同步通知的功能 39 private BlockingQueue<Integer> queue1 = new ArrayBlockingQueue<Integer>(1); 40 private BlockingQueue<Integer> queue2 = new ArrayBlockingQueue<Integer>(1); 41 42 //匿名构造方法 也叫非静态代码块 43 //当创建对象时 该代码块先被执行 44 //保证初始化，在queue2队列中包含一个元素 45 { 46 try 47 { 48 queue2.put(1); 49 } catch (InterruptedException e) 50 { 51 e.printStackTrace(); 52 } 53 } 54 55 56 //子线程调用 循环输出10次 57 public void SubMethod(int j){ 58 try 59 { 60 queue1.put(1);//向q1中存入一个值 61 } catch (InterruptedException e) 62 { 63 e.printStackTrace(); 64 } 65 for (int i = 1; i <= 10; i++) 66 { 67 System.out.println("this is sub thread..."+i+"......."+j); 68 } 69 try 70 { 71 queue2.take();//取出q2中的一个值 72 } catch (InterruptedException e) 73 { 74 e.printStackTrace(); 75 } 76 } 77 //主线程调用循环输出一百次 78 public void MainMethod(int j){ 79 try 80 { 81 queue2.put(1);//一开始queue2队列会被阻塞，因为初始化的时候已经有一个值 82 } catch (InterruptedException e) 83 { 84 e.printStackTrace(); 85 } 86 for (int i = 1; i <= 100; i++) 87 { 88 System.out.println("this is main thread..."+i+"......"+j); 89 } 90 try 91 { 92 queue1.take(); 93 } catch (InterruptedException e) 94 { 95 e.printStackTrace(); 96 } 97 } 98 } 99 }
部分运行结果如下:
this is sub thread...1.......49 this is sub thread...2.......49 this is sub thread...3.......49 this is sub thread...4.......49 this is sub thread...5.......49 this is sub thread...6.......49 this is sub thread...7.......49 this is sub thread...8.......49 this is sub thread...9.......49 this is sub thread...10.......49 this is main thread...1......49 this is main thread...2......49 this is main thread...3......49 this is main thread...4......49 this is main thread...5......49 this is main thread...6......49 this is main thread...7......49 this is main thread...8......49 this is main thread...9......49 this is main thread...10......49 this is main thread...11......49 this is main thread...12......49 this is main thread...13......49 this is main thread...14......49 this is main thread...15......49 this is main thread...16......49 this is main thread...17......49 this is main thread...18......49 this is main thread...19......49 this is main thread...20......49 this is main thread...21......49 this is main thread...22......49 this is main thread...23......49 this is main thread...24......49 this is main thread...25......49 this is main thread...26......49 this is main thread...27......49 this is main thread...28......49 this is main thread...29......49 this is main thread...30......49 this is main thread...31......49 this is main thread...32......49 this is main thread...33......49 this is main thread...34......49 this is main thread...35......49 this is main thread...36......49 this is main thread...37......49 this is main thread...38......49 this is main thread...39......49 this is main thread...40......49 this is main thread...41......49 this is main thread...42......49 this is main thread...43......49 this is main thread...44......49 this is main thread...45......49 this is main thread...46......49 this is main thread...47......49 this is main thread...48......49 this is main thread...49......49 this is main thread...50......49 this is main thread...51......49 this is main thread...52......49 this is main thread...53......49 this is main thread...54......49 this is main thread...55......49 this is main thread...56......49 this is main thread...57......49 this is main thread...58......49 this is main thread...59......49 this is main thread...60......49 this is main thread...61......49 this is main thread...62......49 this is main thread...63......49 this is main thread...64......49 this is main thread...65......49 this is main thread...66......49 this is main thread...67......49 this is main thread...68......49 this is main thread...69......49 this is main thread...70......49 this is main thread...71......49 this is main thread...72......49 this is main thread...73......49 this is main thread...74......49 this is main thread...75......49 this is main thread...76......49 this is main thread...77......49 this is main thread...78......49 this is main thread...79......49 this is main thread...80......49 this is main thread...81......49 this is main thread...82......49 this is main thread...83......49 this is main thread...84......49 this is main thread...85......49 this is main thread...86......49 this is main thread...87......49 this is main thread...88......49 this is main thread...89......49 this is main thread...90......49 this is main thread...91......49 this is main thread...92......49 this is main thread...93......49 this is main thread...94......49 this is main thread...95......49 this is main thread...96......49 this is main thread...97......49 this is main thread...98......49 this is main thread...99......49 this is main thread...100......49 this is sub thread...1.......50 this is sub thread...2.......50 this is sub thread...3.......50 this is sub thread...4.......50 this is sub thread...5.......50 this is sub thread...6.......50 this is sub thread...7.......50 this is sub thread...8.......50 this is sub thread...9.......50 this is sub thread...10.......50 this is main thread...1......50 this is main thread...2......50 this is main thread...3......50 this is main thread...4......50 this is main thread...5......50 this is main thread...6......50 this is main thread...7......50 this is main thread...8......50 this is main thread...9......50 this is main thread...10......50 this is main thread...11......50 this is main thread...12......50 this is main thread...13......50 this is main thread...14......50 this is main thread...15......50 this is main thread...16......50 this is main thread...17......50 this is main thread...18......50 this is main thread...19......50 this is main thread...20......50 this is main thread...21......50 this is main thread...22......50 this is main thread...23......50 this is main thread...24......50 this is main thread...25......50 this is main thread...26......50 this is main thread...27......50 this is main thread...28......50 this is main thread...29......50 this is main thread...30......50 this is main thread...31......50 this is main thread...32......50 this is main thread...33......50 this is main thread...34......50 this is main thread...35......50 this is main thread...36......50 this is main thread...37......50 this is main thread...38......50 this is main thread...39......50 this is main thread...40......50 this is main thread...41......50 this is main thread...42......50 this is main thread...43......50 this is main thread...44......50 this is main thread...45......50 this is main thread...46......50 this is main thread...47......50 this is main thread...48......50 this is main thread...49......50 this is main thread...50......50 this is main thread...51......50 this is main thread...52......50 this is main thread...53......50 this is main thread...54......50 this is main thread...55......50 this is main thread...56......50 this is main thread...57......50 this is main thread...58......50 this is main thread...59......50 this is main thread...60......50 this is main thread...61......50 this is main thread...62......50 this is main thread...63......50 this is main thread...64......50 this is main thread...65......50 this is main thread...66......50 this is main thread...67......50 this is main thread...68......50 this is main thread...69......50 this is main thread...70......50 this is main thread...71......50 this is main thread...72......50 this is main thread...73......50 this is main thread...74......50 this is main thread...75......50 this is main thread...76......50 this is main thread...77......50 this is main thread...78......50 this is main thread...79......50 this is main thread...80......50 this is main thread...81......50 this is main thread...82......50 this is main thread...83......50 this is main thread...84......50 this is main thread...85......50 this is main thread...86......50 this is main thread...87......50 this is main thread...88......50 this is main thread...89......50 this is main thread...90......50 this is main thread...91......50 this is main thread...92......50 this is main thread...93......50 this is main thread...94......50 this is main thread...95......50 this is main thread...96......50 this is main thread...97......50 this is main thread...98......50 this is main thread...99......50 this is main thread...100......50