Visitor: Problem
Example: exporting the graph into XML format
示例:将图表导出为 XML 格式
Visitor: Solution
Place the new behavior into a separate class called visitor
The original object passed to the visitor’s method as an argument
Example: exporting the graph into XML format
示例:将图表导出为 XML 格式
Place the new behavior into a separate class called visitor
The original object passed to the visitor’s method as an argument
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