tucuxi
2020-11-30 05:43:56
You are attempting to pass a lambda that should implement Comparable as an argument to max, but Comparable must return an int, while you are producing a double as the result of subtracting a double from another.
You can fix this easily by using Double.compare(e1.getValue(), e2.getValue()) instead of subtracting both values:
Node bestNode = Collections.max(coinD.entrySet(),
(e1, e2) -> Double.compare(e1.getValue(), e2.getValue())).getKey();
@ernest_k also has a good point: if the values of your map are have a natural sort order, and you want to use that order, Map.Entry.comparingByValue yields slightly shorter code:
Node bestNode = Collections.max(coinD.entrySet(),
(e1, e2) -> Map.Entry.comparingByValue()).getKey();
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Thanks for the answer- just to clarify, what would a "natural sort order" constitute?
@rjc810 - take a look at What is natural ordering when we talk about sorting? - that may help.