how to insert duplicate key in hashmap

Helpless Hedgehog answered on August 25, 2020 Popularity 10/10 Helpfulness 2/10

answer how to insert duplicate key in hashmap

how to insert duplicate key in hashmap

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Map<String, List<String>> map = new HashMap<>();map.computeIfAbsent("key1", k -> new ArrayList<>()).add("value1");map.computeIfAbsent("key1", k -> new ArrayList<>()).add("value2"); assertThat(map.get("key1").get(0)).isEqualTo("value1");assertThat(map.get("key1").get(1)).isEqualTo("value2");

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Contributed on Aug 25 2020

Helpless Hedgehog

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how to insert duplicate key in hashmap

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