黑马程序员---线程

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java.util.concurrent    //并发库

java.util.concurrent.atomic

java1.5创建线程方法

public class Demo {public static void main(String[] args) {// ExecutorService exe=Executors.newFixedThreadPool(3); ExecutorService exe = Executors.newCachedThreadPool();// ExecutorService exe = Executors.newSingleThreadExecutor();/*for (int i = 0; i < 10; i++) {final int task = i;exe.execute(new Runnable() {@Overridepublic void run() {for (int j = 0; j < 10; j++) {try {Thread.sleep(50);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("Thread name:"+ Thread.currentThread().getName() + "任务执行次数："+ j + "任务号：" + task);}}});}exe.shutdown();// ExecutorService*/Executors.newScheduledThreadPool(3).schedule(new Runnable(){@Overridepublic void run() {for (int i =1; i < 11; i++) {System.out.println("Thread name:"+ Thread.currentThread().getName());}}},1,TimeUnit.SECONDS);}}

读写锁：

public class LockTest {ReentrantReadWriteLock lock= new ReentrantReadWriteLock();int i;public static void main(String[] args) {final LockTest l=new LockTest();for (int i = 0; i < 3; i++) {new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(1000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}l.read();}}}).start();new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(1000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}l.write();}}}).start();}}void read(){lock.readLock().lock();try {System.out.println("开始读....."+Thread.currentThread().getName());Thread.sleep((long) (Math.random()*1000));System.out.println("这是读: "+Thread.currentThread().getName()+"值："+i);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{lock.readLock().unlock();}}void write(){lock.writeLock().lock();try {++i;System.out.println("开始写....."+Thread.currentThread().getName());System.out.println("写: "+Thread.currentThread().getName()+"写值为:"+i);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{lock.writeLock().unlock();}}}

可以多个线程同时读取读锁里的数据。但在读数据的线程没有释放锁的情况下，写的线程不能写，反之亦然，也就是说读写不能同时进行。在写锁的线程中，只能一个线程写入，禁止其他写线程进入写锁中。

 

Lock：

public class Demo2 {public static void main(String[] args) {final BB b=new BB();new Thread(new Runnable(){@Overridepublic void run() {while(true){b.one();}}}).start();new Thread(new Runnable(){@Overridepublic void run() {while(true){b.two();}}}).start();new Thread(new Runnable(){@Overridepublic void run() {while(true){b.three();}}}).start();}}class BB {Lock lock = new ReentrantLock();Condition one = lock.newCondition();Condition two = lock.newCondition();Condition three = lock.newCondition();int couts = 1;void one() {lock.lock();try {while (couts != 1) {try {one.await();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}couts++;System.out.println("one.......");two.signal();}finally{lock.unlock();}}void two() {lock.lock();try {while (couts != 2) {try {two.await();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}couts++;System.out.println("two.......");three.signal();}finally{lock.unlock();}}void three() {lock.lock();try {while (couts != 3) {try {three.await();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}couts=1;System.out.println("three.......");one.signal();}finally{lock.unlock();}}}

Semaphore:

一个计数信号量。从概念上讲，信号量维护了一个许可集。如有必要，在许可可用前会阻塞每一个 acquire()，然后再获取该许可。每个release() 添加一个许可，从而可能释放一个正在阻塞的获取者。但是，不使用实际的许可对象，Semaphore 只对可用许可的号码进行计数，并采取相应的行动。

Semaphore 通常用于限制可以访问某些资源（物理或逻辑的）的线程数目。

 

public class Test {public static void main(String[] args) {finalSemaphore semaphore=new Semaphore(1);//1为信号量数,允许线程访问的数量for (int i = 0; i < 3; i++) {new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {semaphore.acquire();//获得一个信号，没有获得信号的线程阻塞状态中System.out.println("Thread :"+Thread.currentThread().getName()+" 获得了信号");System.out.println("哥出来了 要信号给你");semaphore.release();//释放一个信号。Thread.sleep(1000);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}).start();}}}

SynchronousQueue:

一种阻塞队列，其中每个put操作必须等待另一个线程的对应task操作 ，反之亦然。就是说put一个元素后，此线程要是还想put一个元素那必须得等task一个元素后才能put，同时线程进入阻塞状态。反过来也一样；

 

public class Test {public static void main(String[] args) {final SynchronousQueue<String> queue = new SynchronousQueue<String>();// 线程1new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {System.out.println("hi！哥们，我放个东西放你这啊，我等下来取，你别走啊");queue.put("AK-47");Thread.sleep(1000);//让线程sleep1秒是避免hi!哥们出现重复。因为put后可能线程还有cup执行权。} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}).start();// 线程2new Thread(new Runnable() {@Overridepublic void run() {while(true){try {String str=queue.take();System.out.println("好，赶快过来取" + "物品：" +str);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}).start();}}

 

public class Test {public static void main(String[] args) {final Semaphore semaphore=new Semaphore(1);final BlockingQueue<String> queue = new SynchronousQueue<String>();System.out.println("begin:" + (System.currentTimeMillis() / 1000));for (int i = 0; i < 10; i++) { String input = i + ""; try {System.out.println("fd");//put一个元素，线程就阻塞.等task()完了后线程才恢复,所以主线程阻塞，//下面的子线程启动不了，下面的for（）应该放在此for（）上。queue.put(input); } catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}for (int i = 1; i < 11; i++) {new Thread(new Runnable() {@Overridepublic void run() {try {semaphore.acquire();String str = (String) queue.take();String output = TestDo.doSome(str);System.out.println(Thread.currentThread().getName()+ ":" + output);semaphore.release();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}).start();}}}class TestDo {public static String doSome(String input) {try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}String output = input + ":" + (System.currentTimeMillis() / 1000);return output;}}

 

LinkedBlockingDeque:(java1.6)

public class Test {public static void main(String[] args) {final LinkedBlockingDeque<Integer> queue = new LinkedBlockingDeque<Integer>(3);//队列的大小for (int i = 0; i < 3; i++) {new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {System.out.println("put couts:");queue.put(1);System.out.println("queue的大小:"+queue.size());} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}).start();}new Thread(new Runnable() {@Overridepublic void run() {while(true){try {int temp=queue.take();System.out.println("take数据  "+"queue的大小:"+queue.size());} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}).start();}}

 

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