我上课整理出来的多线程的例子，大家看看。包括：
使用Thread创建线程；使用Runnable创建线程；实例：让人能够同时说话和开车；实例：模拟生成者和消费者。1、使用Thread实现多线程
示例代码：
package ch18; public class ThreadTest extends Thread{ public boolean b=false; public static void main(String[] args) { ThreadTest thread = new ThreadTest(); thread.setName("child"); thread.start(); try { thread.join(); } catch (InterruptedException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } ThreadTest thread1 = new ThreadTest(); thread1.setName("child-------"); thread1.start(); for(int i=0;i<5;i++){ try { sleep(100); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println(currentThread().getName()+":"+i); } thread.b = true; thread1.b = true; } public void run(){ for(int i=0;i<10;i++){ try { sleep(100); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println(currentThread().getName()+":"+i); if(b) break; } } }
2、使用Runnable实现多线程
示例代码：
package ch18; public class RunnableTest implements Runnable{ public static void main(String[] args) { Runnable r1 = new RunnableTest(); Thread thread = new Thread(r1,"t1"); thread.start(); thread.setPriority(9); Thread thread2 = new Thread(r1,"t2"); thread2.start(); thread2.setPriority(2); } public void run(){ for(int i=0;i<100;i++){ System.out.println(Thread.currentThread().getName()+":"+i); } } }
3、实例：让人能够同时说话和开车
示例代码：
package ch19; import static java.lang.System.out; public class Person implements Runnable{ int speakNo=0; int driveNo=0; private boolean canStop=false; // 是否停止线程 public static void main(String[] args) { Person person = new Person(); Thread t1 = new Thread(person,"speak"); // 第二个参数给出线程的名字 Thread t2 = new Thread(person,"drive"); t1.setPriority(8); t2.setPriority(4); t1.start(); t2.start(); try { Thread.currentThread().sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } person.setCanStop(true); } public void run(){ while(true){ String name = Thread.currentThread().getName(); // 得到当前线程 的名字 if(name.equals("speak")){ speak(); }else{ drive(); } if(canStop){ break; } } } public void drive(){ out.println("正在--------------开车！"+driveNo++); // try { // Thread.currentThread().sleep(5); // } catch (InterruptedException e) { // e.printStackTrace(); // } } public void speak(){ out.println("正在说话！"+speakNo++); // try { // Thread.currentThread().sleep(5); // } catch (InterruptedException e) { // e.printStackTrace(); // } } public boolean isCanStop() { return canStop; } public void setCanStop(boolean canStop) { this.canStop = canStop; } }
4、实例：模拟生成者消费者模型
示例代码：
package ch19; import static java.lang.System.out; // 第一步：实现Runnable接口，并且实现run方法 public class Factory implements Runnable { // 第二步：定义表示库存变量quantity，quantity的值会影响生产和消费这两个方法的执 行，有产品才可以消费，仓库没有满才可以生产 // 库存，初始为0，最大为10 private int quantity = 0; // 第六步：创建成员变量canStop控制线程的结束，主线程中修改控制变量的值，在生产和 消费线程中判断该变量的值，然后结束线程。 private boolean canStop = false; public int getQuantity() { return quantity; } public void setQuantity(int quantity) { this.quantity = quantity; } public boolean isCanStop() { return canStop; }a public void setCanStop(boolean canStop) { this.canStop = canStop; } // 第四步：创建工厂对象，然后创建生产和消费的线程并启动 public static void main(String args[]) { Factory factory = new Factory(); Thread t1 = new Thread(factory, "producer1"); Thread t2 = new Thread(factory, "producer2"); Thread t3 = new Thread(factory, "consumer1"); Thread t4 = new Thread(factory, "consumer2"); t1.start(); t2.start(); t3.start(); t4.start(); try { Thread.currentThread().sleep(300); } catch (InterruptedException e) { e.printStackTrace(); } factory.setCanStop(true); } // 第五步：实现run方法，根据当前线程的任务去调用相应的方法，或者去生产 或者消费 public void run() { String threadName = Thread.currentThread().getName(); while (true) { if (threadName.startsWith("producer")) { produce(); } else { consume(); } if(canStop) break; } } // 第三步：定义消费和生产的方法 public synchronized void consume() { // 判断是否有商品 while (quantity == 0) { try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } } // 消费商品 quantity--; String threadName = Thread.currentThread().getName(); out.println(threadName + "消费了一个商品！"); try { Thread.currentThread().sleep(50); } catch (InterruptedException e) { e.printStackTrace(); } notifyAll(); } // 生成商品 public synchronized void produce() { // 判断仓库是否已经满了，如果满了，就等待 while (quantity == 10) { try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } } // 生产 quantity++; String threadName = Thread.currentThread().getName(); out.println(threadName + "生产了一个商品！"); try { Thread.currentThread().sleep(50); } catch (InterruptedException e) { e.printStackTrace(); } notifyAll(); } }
