如何通过多线程取出ResultSet里面的数据？

如题所示，我自己写了一个demo，但是发现有点问题，不知道如何解决，求大神看看问题在哪？
如果用三个task就会少两条数据，如果是四个task，就少3条数据，以此类推~

main方法

取数据的线程

model

This method does not wait for previously submitted tasks to
* complete execution. Use {@link #awaitTermination awaitTermination}
* to do that.

void shutdown()

This method does not wait for previously submitted tasks to
* complete execution. Use {@link #awaitTermination awaitTermination}
* to do that.