Use the visitor design pattern to create another example visitor class, say NumberCollector, which collects all numbers

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Use the visitor design pattern to create another example visitor class, say NumberCollector, which collects all numbers that appear in the AST in a list. For example, three numbers, “3,” “4,” and “2,” appear in the AST of the program “(+ 3 4 2).” The methods in NumberCollector also should not use any global or static variables. The NumberCollector class should not have any fields.

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In the visitor design pattern the operation applied to objects depends on both their class and the class of the visitor Thus a class that collects num...View the full answer

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