本程序制作模拟钢琴的实例。程序执行后，创建一个带有模拟钢琴键盘的面板，用户可以通过键盘或者鼠标来“敲击”钢琴键盘发出声音，也可以通过电脑键盘的组合键实现钢琴的高音。-This procedure produced an example of simulation of the piano. Procedures implemented, to create a simulation of the piano keyboard with a panel, the user can, through

排列组合的源代码， java实现能实现C(M,N)和P(M,N)的任意对象排列组合-combine and permute algrithm, implemented by java.