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Volatile?Java????????????????????????????????????????????????????????????????????????????????Volatile?????????????????????????
?Java????????Lock??????????????????synchronized???????????????????????????Lock??????????????????????ReentrantLock?
?????????????????????????????????????????????????????????????????????????????????
?????Volatile?Lock??????????
public class Demo { private volatile int a = 1; private Lock lock = new ReentrantLock(); public int getA() { lock.lock(); return a; } public void setA(int a) { lock.lock(); try { Thread.sleep(2); } catch (InterruptedException e) { e.printStackTrace(); } this.a = a; lock.unlock(); } public static void main(String[] args) { Demo d = new Demo(); d.a = 10; new Thread(new Runnable() { @Override public void run() { System.out.println(d.a); } }).start(); try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("??????" + d.getA()); }} Volatile?Lock???Java???????????Volatile?????????????????Lock????????????????????????????????????????????
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