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java练习多线程
1、创建多线程方式继承Thread类
class ThreadDemo1{ public static void main(String args[]){ Demo1 d1 = new Demo1(); d1.start(); Demo1 d2 = new Demo1(); d2.start(); } } class Demo1 extends Thread{ public void run(){ show(); } public void show(){ while(true){ try{Thread.sleep(3000); }catch(InterruptedException e){ } System.out.println("ол╣Щ"+Thread.currentThread().getName()); } } }
2、实现多线程第二种方式Runnable接口
class ThreadDemo2{ public static void main(String[]args){ Demo d1 = new Demo(); Thread t1 = new Thread(d1); Thread t2 = new Thread(d1); Thread t3 = new Thread(d1); Thread t4 = new Thread(d1); t1.start(); t2.start(); t3.start(); t4.start(); } } class Demo implements Runnable{ private int sum; public void show(){ for(int x=0;x<20;x++){ synchronized(this){ sum+=100; System.out.println(Thread.currentThread().getName()+"银行金库实时金额:"+sum); } } } public void run(){ show(); } }
3、多线程中的同步代码块、同步函数、静态同步函数需要注意的事项
当函数名用static修饰时,同步锁不能用this,static函数的锁使用对象.getClass()获取的字节码文件或者类名.class获取;
class ThreadDemo3{ public static void main(String[]args){ Demo d1= new Demo(); Thread t1 = new Thread(d1); Thread t2 = new Thread(d1); Thread t3 = new Thread(d1); Thread t4 = new Thread(d1); t1.start(); t2.start(); try{Thread.sleep(10);}catch(InterruptedException e){} Demo.flag=false; t3.start(); t4.start(); } } /* new Thread(d1);任务封装后在Thread类里面的传递过程 class Thread1 implements Runnable{ Runnable r1; Thread1(Runnable r1){ this.r1=r1; } public void run(){ if(r1!=null) r1.run(); } public void start(){ run(); } } */ class Demo implements Runnable{ public static boolean flag=true; private static int num=300; public void run(){ if(flag){ while(true) method(); }else{ synchronized(Demo.class){ while(true) if(num>0){ try{Thread.sleep(30);}catch(InterruptedException e){} System.out.println("同步代码块售票口:"+Thread.currentThread().getName()+"已售出万达电影院门票号:"+num--); } } } } public synchronized static void method(){ if(num>0){ try{Thread.sleep(30);}catch(InterruptedException e){} System.out.println("同步函数售票口:"+Thread.currentThread().getName()+"已售出万达电影院门票号:"+num--); } } }
java练习多线程
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