i++操作非原子的验证代码

 package incre;

 public class Incre {
     public static void main(String[] args) {
         class Count implements Runnable {
             public int num;
             @Override
             public void run() {
                 //自增操作，非原子操作，线程不安全
 //                for (int i = 0; i < 10000; i++) {
 //                    num++;
 //                }

                 //对代码进行同步，查看正确结果。
                 synchronized (this) {
                     for (int i = 0; i < 10000; i++) {
                         num++;
                     }
                 }
             }

             public int getNum(){
                 return num;
             }
         }

         Count c = new Count();

         //创建多个线程
         final int THREAD_COUNT = 10;
         Thread[] threadArray = new Thread[THREAD_COUNT];
         for(int i = 0; i < threadArray.length; i++){
             threadArray[i] = new Thread(c);
         }

         //启动多个线程
         for(Thread t : threadArray){
             t.start();
         }

         //等待这些线程结束
         for(Thread t : threadArray){
             try {
                 t.join();
             } catch (InterruptedException e) {
                 e.printStackTrace();
             }
         }

         //查看计数结果
         System.out.println("计数结果：" + c.getNum());
     }
 }

i++非原子操作验证代码