Common-function-about-Java-class

代码说明：

  这个Java类可以用来求出随机数，算出0至1之间的随机小数，然后乘以100，这样就能求出0至100之间的随机整数了。(The Java class can be used to seek the random, and work out between 0 to 1 random decimal, and then multiplied by 100, so they could work out between 0 to 100 of the random integer. )