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Statement: Forwarding on behalf of friends does not represent the objective point of this blog.This mode applies to scenarios: If we want to add new functions to an existing class, we have to consider several things: 1. Will the new functions have compatibility problems with the existing functions? 2. Will it need to be added later? 3. What if the class does not allow code modification? Facing these problems, the best solution is to use visitor mode, which is suitable for systems with relatively stable data structure, decoupling data structure and algorithm,Return context.getNum1 ()-context.getNum2 ();Take the website of "Learning Power" as an example, the "Red China" section is convenient for everyone to learn about Party history. It has eternal monuments, classic works, red memories, party history study and other columns. The column "Forever Monument" introduces the stories of heroes such as Li Dazhao, Cai Hesen, Liu Hulan, Ma Benzhai, Qiu Shaoyun and Deng Enming. The column "Learning Party History" answered the questions of why founding ceremony's salute fired 28 rounds, why the "Rice and Cotton War" took place in the early days of Shanghai's liberation, and why Mao Zedong affirmed Chen Duxiu's achievements at the Seventh National Congress of the Communist Party of China.所以，仅过了两天，陈启便带着许岚离开了。　　俞作柏和李明瑞回桂主政。俞作柏向中共提出请求，派干部协助其工作。中共中央把大批干部派往广西。军委书记周恩来亲自向邓小平交代任务，派他为中共中央代表，前往广西主持工作，