Sliding Puzzle Game By Java

代码说明：

Numeric Sliding Puzzle is a simple type of game where a user clicks on a sliding tile (containing a number) in order to move it to another location. A tile can only be moved to another location if it is neighbour to a blank tile. The game continues until all the tiles are in the correct order; e.g. for a 3*3 size puzzle, the correct order of the tiles is blank tile, 1, 2, 3, 4, 5, 6, 7, 8.