<dependencies> <dependency> <groupId>org.eclipse.collections</groupId> <artifactId>eclipse-collections</artifactId> <version>10.4.0</version> </dependency> </dependencies> compile 'org.eclipse.collections:eclipse-collections:10.4.0' MutableList<Integer> list = Lists.mutable.with(1, 2, 3, 4, 5); MutableList<Integer> evenNumbers = list.select(n -> n % 2 == 0); MutableList<String> strings = list.collect(String::valueOf); String joinedString = strings.makeString(","); list.each(System.out::println);