1．简单方块游戏

编写一个简单的移动方块游戏。程序运行后的初始界面如图2-1所示。



图2-1

当按下数字键1、2、3、4之一时代表选择相应的蓝色方块，这时被选中的蓝色方块变为红色，其他3个方块仍为蓝色。

选中方块后，按↑、↓、←、→四个方向键移动被选中的方块，当4个方块都被移动到中间的红色方格中，游戏结束。游戏结束后的界面如图2-2所示。







图2-2

注意事项：

4个方块在移动过程中不能重叠

本程序只编写并提交一个源代码文件Game.java，可以在其中编写多个类，不要编写多个源文件

-1. Write a simple puzzle game simple mobile puzzle game. After running the initial screen shown in Figure 2-1. Figure 2-1 When you press one of the number keys 1,2,3,4 representatives select the appropriate blue box, blue box is selected then turns red, the other three boxes remain blue. Select the box, press ↑, ↓, ←, → four arrow keys to move the selected box when four boxes have been moved to the middle of the red squares, the game ends. After the game' s interface is shown in Figure 2-2. Figure 2-2 Note: 4 boxes during the move should not overlap the program only to prepare and submit a source code file Game.java, in which you can write multiple classes, do not write multiple source files