Java并发之不可思议的死循环详解

package com.zzj.concurrency;public class VolatileObjectTest implements Runnable{ private ObjectA objectA; // 加上volatile 就可以正常结束While循环了  public VolatileObjectTest(ObjectA a) {     this.objectA = a;   }     public ObjectA getA() {     return objectA;   }     public void setA(ObjectA a) {     this.objectA = a;   }     @Override   public void run() {     long i = 0;     while (objectA.isFlag()) {       i++;     }     System.out.println("stop My Thread " + i);   }     public void stop() {     objectA.setFlag(false);   }     public static void main(String[] args) throws InterruptedException {      // 如果启动的时候加上-server 参数则会 输出 Java HotSpot(TM) Server VM     System.out.println(System.getProperty("java.vm.name"));           VolatileObjectTest test = new VolatileObjectTest(new ObjectA());     new Thread(test).start();       Thread.sleep(1000);     test.stop();     System.out.println("Main Thread " + test.getA().isFlag());   }     static class ObjectA {     private boolean flag = true;       public boolean isFlag() {       return flag;     }       public void setFlag(boolean flag) {       this.flag = flag;     }     } }

while (objectA.isFlag()) {     i++;}

if(objectA.isFlag()){  while(true){    i++;  }}