Extract numbers in JAVA - done with JCreator Pro - learning example

手机号处理工具，可从任意文本中提取手机号，用RCP开发。-Phone number processing tools, extract phone numbers from any text RCP development.

（1）实现一个小型计算器的功能，即输入一个表达式，然后从表达式中提取出两个数字和一个运算符，最后输出计算结果。 （2）猜数游戏((1) realize the function of a small calculator, that is, input an expression, then extract two numbers and an operator from the expression, and finally output the calculation result. (