Java8 list to map

June 23, 2019 java

List<T > to Map<S,T >

Map<String,DemoEntity> map = stats.stream().collect(Collectors.toMap(DemoEntity::getKey,
                c -> c));

Map<String,DemoEntity> result = items.stream().collect(Collectors.toMap(DemoEntity::getKey,
                c -> c,(e1,e2) -> e1));

Map<String,String> map = stats.stream().collect(Collectors.toMap(DemoEntity::getKey,
                DemoEntity::getStringValue));

Map<String,List<DemoEntity>> map = vars.stream().collect(Collectors.groupingBy(DemoEntity::getKey));