“Peta multi-nilai, peta” Kode Jawaban

peta multi-nilai, peta >, mendukung beberapa nilai per kunci

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");