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陆炳病了。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:A DDoS attack is an attempt by an attacker to deplete resources available to a network, application, or service so that real users cannot access these resources. It is an attack by a group of malware infected computers or voluntary client computers that attempt to deplete the resources of a specific network, website or service. However, not all DDoS attacks operate in the same way.怎么说呢溪蒨。张耳笑道：正是如此。Component: Obviously, the four components are set, and the components specified by it will be directly used. With this attribute, communication between different application components can be realized.