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Is to define a main method calculate in the AbstractCalculator class, calculate () calls spilt (), etc. Plus and Minus inherit the AbstractCalculator class respectively, and implement the call to subclasses through the call to AbstractCalculator, see the following example:Here are the steps for configuring iptables-service in centos7不着急。Professional decoration companies will sign a formal contract with customers before the formal start of construction. If there are quality or engineering problems after the decoration, most of them can have more responsibility, but pay attention! When signing the contract, the customer must understand all the details in the text, and what he does not understand must be made clear. At the same time, the responsibility for the project quality and problems must be reflected in the contract.3. Print screenshots of all bank flow that have been recharged (withdrawn) on the platform.可之前很多事情证明，胡宗宪总不给人留余地。皇上，请先消消火，再大的事，也不能扰了清修。