Thespringofmulti-thread——线程安全的另一种解决思路.ppt

The spring of multi-thread —— 线程安全的另一种解决思路 我需要一个可靠的单例模式！！ 上堂回顾 public class InnDao { private volatile static InnDao instance; private InnDao(){} public static InnDao getInstance() { if (instance == null){ synchronized (InnDao.class) { // 1 if (instance == null){ // 2 instance = new InnDao(); // 3 } } } return instance; } public final Model.FinderInteger,Inn finder = new Model.FinderInteger, Inn(Integer.class, Inn.class); } 关于Volatile与同步操作共同使用的思考 public class ThreadClient extends Thread { private static int count; public void run(){ for(int i=0;i3;i++){ System.out.println(当前线程名：+Thread.currentThread().getName() + count=+count); count++; } } public static void main(String[] args) { ThreadClient tc1 = new ThreadClient(); ThreadClient tc2 = new ThreadClient(); ThreadClient tc3 = new ThreadClient(); tc1.start(); tc2.start(); tc3.start(); } } 当前线程名：Thread-1 count=0 当前线程名：Thread-1 count=1 当前线程名：Thread-1 count=2 当前线程名：Thread-2 count=3 当前线程名：Thread-2 count=4 当前线程名：Thread-2 count=5 当前线程名：Thread-0 count=6 当前线程名：Thread-0 count=7 当前线程名：Thread-0 count=8 public class ThreadClient extends Thread { private static ThreadLocalInteger count = new ThreadLocal(); public ThreadClient(Integer value){ count.set(value); } public void run(){ for(int i=0;i3;i++){ System.out.println(当前线程名：+Thread.currentThread().getName() + count=+count.get()); count.set(count.get()+1); try { TimeUnit.SECONDS.sleep(1); } catch (InterruptedException e) { e.printStackTrace(); } } } public static void main(String[] args) { ThreadClient tc1 = new ThreadClient(0); ThreadClient tc2 = new ThreadClient(0); ThreadClient tc3 = new ThreadClient(0); tc1.start(); tc2.start(); tc3.start(); } } Except