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java arraylist get number of elements with same parameter

philippklmr answered on July 9, 2022 Popularity 3/10 Helpfulness 7/10

answer java arraylist get number of elements with same parameter

java arraylist get number of elements with same parameter

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// Example Poker:
// ArrayList of PokerCards (hand)
// 		-> Map with - Suit (parameter of object) as key
// 					- List<PokerCard> (List of objects with that parameter) as value
Map<Suit, List<PokerCard>> map = hand.stream().collect(Collectors.groupingBy(PokerCard::getSuit));

// Now you can get the number of elements for each parameter like that:
map.keySet().forEach(s -> {
	System.out.println(s.name() + " " + map.get(s).size());
});

Popularity 3/10 Helpfulness 7/10 Language java

Source: Grepper

Tags: arraylist elements get java

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Contributed on Jul 09 2022

philippklmr

0 Answers Avg Quality 2/10

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java arraylist get number of elements with same parameter

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