/**
 *程式碼說明：演示帶版本戳的原子操作類
 */
public class UseAtomicStampedReference {
    static AtomicStampedReference<String> asr
            = new AtomicStampedReference("mark",0);

    public static void main(String[] args) throws InterruptedException {
        //拿到當前的版本號(舊)
        final int oldStamp = asr.getStamp();

        final String oldReference = asr.getReference();
        System.out.println(oldReference+"============"+oldStamp);

        Thread rightStampThread = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println(Thread.currentThread().getName()+":當前變數值："
                        +oldReference + "-當前版本戳：" + oldStamp + "-"
                  + asr.compareAndSet(oldReference,
                        oldReference + "+Java", oldStamp,
                        oldStamp + 1));
            }
        });

        Thread errorStampThread = new Thread(new Runnable() {
            @Override
            public void run() {
                String reference = asr.getReference();
　　　　　　　　　　//獲取了最新的值，但是版本號是舊的，所以更新失敗
                System.out.println(Thread.currentThread().getName()
                        +":當前變數值："
                        +reference + "-當前版本戳：" + asr.getStamp() + "-傳入版本戳"+oldStamp
                        + asr.compareAndSet(reference,reference + "+C",
                                            oldStamp,oldStamp +1));
            }
        });
        rightStampThread.start();
        rightStampThread.join();  
        errorStampThread.start();
        errorStampThread.join();

        System.out.println(asr.getReference()+"============"+asr.getStamp());
    }
}