<dependency> <groupId>org.eclipse.collections</groupId> <artifactId>eclipse-collections-api</artifactId> <version>{version}</version> </dependency> MutableList<Integer> list = Lists.mutable.with(1, 2, 3, 4, 5); MutableList<Integer> evenNumbers = list.select(n -> n % 2 == 0); MutableList<String> stringList = list.collect(Object::toString); list.sortThis(); int sum = list.sumOfInt(n -> n); MutableList<Integer> evenNumbers = ParallelIterate.select(list, n -> n % 2 == 0); ImmutableList<Integer> immutableList = Lists.immutable.with(1, 2, 3, 4, 5);