Convert list to map java 8

- Convert list to map java 8 duplicate key
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- Convert list to map java 8 lambda
- Convert list to map java 8 using stream
- Convert list to map java 8 stack overflow
- Convert list string to map java 8
- Convert object list to map java 8
- Convert nested list to map java 8
- Convert list of objects to map java 8
- Convert list of integer to map java 8
- Convert list to map string object java 8
- Convert list of objects to map java 8 stream
- Convert list to map of set java 8