Some useful lambda implements for Java 8.
<dependency>
<groupId>com.github.phantomthief</groupId>
<artifactId>more-lambdas</artifactId>
<version>0.1.15</version>
</dependency>advanced distinct
List<String> list = ....;
List<String> result = list.stream() //
.filter(MorePredicates.distinctUsing(Object::hashCode)) // distinct using hashCode
.collect(Collectors.toList());more collectors
Map<Integer, String> map = ...;
map.entrySet().stream() //
... // some ops
.collect(MoreCollectors.toMap()); // no need to map key and value again if it's an entry stream.also, there is simple HPPC support in MoreCollectors.