Java逐步实现俄罗斯方块,包括1图形的实现，2旋转的实现3不闪烁的实现4不出范围的实现5自动下沉的实现等 -Java and gradually realize the Russian box, including one graphics implementation, implementation of the 2 rotation 3 is not blinking not realize the scope of implementation 4 automatic 5 imple