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一个计算器类(Calculator),可以实现两个数的加、减、乘、除运算,并可以进行undo和redo操作

本case采用命令模式:

  • 实现了两个Receiver(分别是BigDecimalCalculator 和 IntCalculator)
  • 采用面向对象的思想对CalculateInvoker实现了计算器封装
  • 启动类CalculateApplication 有分别提供两个Receiver的调用示例

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