class MyNumber{
    int number;
    public synchronized void addplus(){
        number++;
    }
}
public class VolatileNoAtomicDemo {
    public static void main(String[] args) {
        MyNumber mynumber = new MyNumber();
        for(int i = 1;i<=10;i++){
            new Thread(()->{
                for (int j = 1; j <= 1000; j++) {
                    mynumber.addplus();
                }
            },String.valueOf(i)).start();
        }
        //暂停2秒中
        try{ TimeUnit.SECONDS.sleep(2);}catch(InterruptedException e) {e.printStackTrace();}
        System.out.println(mynumber.number);
    }
}
运行结果：
10000

class MyNumber{
    volatile int number;
    public void addplus(){
        number++;
    }
}
public class VolatileNoAtomicDemo {
    public static void main(String[] args) {
        MyNumber mynumber = new MyNumber();
        for(int i = 1;i<=10;i++){
            new Thread(()->{
                for (int j = 1; j <= 1000; j++) {
                    mynumber.addplus();
                }
            },String.valueOf(i)).start();
        }
        //暂停2秒中
        try{ TimeUnit.SECONDS.sleep(2);}catch(InterruptedException e) {e.printStackTrace();}
        System.out.println(mynumber.number);
    }
}
结果为：
9445  不是10000；