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Java Collections Map Example
In generic code, the question mark (?), called the wildcard, represents an unknown type. You will identify each number by the name it has: It does not mean you can create a map<key, ?> and insert values of any type in it.
Map Collections In Java With Examples - Dot Net Tutorials from dotnettutorials.net
How to compare elements in a <strong>collection</strong>? In your example, map<key, ?>, it means that it will match a map containing values of any type. We covered the main operations through a hashmap as well as a few interesting extensions such as sortedmap or concurrentmap.
Collectors tomap to other map types as of now we wrote the examples.
Map<string, string><strong> map</strong> = map.of(); We covered the main operations through a hashmap as well as a few interesting extensions such as sortedmap or concurrentmap. In all of these returned map is hashmap. It does not mean you can create a map<key, ?> and insert values of any type in it.
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