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A program based on policy mode consists of at least two parts. The first part is a set of policy classes, which encapsulate specific algorithms and are responsible for specific calculation processes. The second part is the environment class Context, which receives the client's request and then delegates the request to a policy class. We first use traditional object-oriented to implement it.此时此刻，最担心的事情还是发生了。4Um, * * Enhance Sa's "Document Number": Decree No.21 of the Ministry of Labor and Social Security of the People's Republic of ChinaAfter the ball is thrown into the basket and approved by the referee, it is counted as a score. 2 points can be scored for the input inside the 3-point line; 3 points can be scored if you put on the outside of the 3-point line, and the ball scored by stepping on the 3-point line with your heel or toe is regarded as a 2-point ball. One point from the free throw.