Java Volatile关键字同步机制详解

public class VolatileCase {
  //未加volatile关键字
  private static boolean ready = false;
  private static int number = 0;
  private static class ThreadInfo extends Thread{
    @Override
    public void run() {
      System.out.println("Thread start");
      while (!ready);
      System.out.println("number:"+number+"----ready:"+ready+"Thread end");
    }
  }
  public static void main(String[] args) throws InterruptedException {
    new ThreadInfo().start();
    Thread.sleep(100);
    ready = true;
    number = 123;
    Thread.sleep(100);
    System.out.println("main end");
  }
}

public class VolatileCase {
  //Volatile关键字
  private volatile int count = 0;

  public int getCount() {
    return count;
  }

  public void setCount(int count) {
    this.count = count;
  }

  public void inCount(){
      count++;
  }

  private static class ThreadInfo extends Thread{
    private VolatileCase vc;
    public ThreadInfo(VolatileCase vc){
      this.vc = vc;
    }
    @Override
    public void run() {
      for (int i = 0; i < 10000; i++) {
        vc.inCount();
      }
    }
  }
  public static void main(String[] args) throws InterruptedException {
    VolatileCase vc = new VolatileCase();
    ThreadInfo threadInfo1 = new ThreadInfo(vc);
    ThreadInfo threadInfo2 = new ThreadInfo(vc);
    threadInfo1.start();
    threadInfo2.start();
    Thread.sleep(100);
    System.out.println("main end："+vc.getCount());
  }
}