<dependency> <groupId>org.eclipse.collections</groupId> <artifactId>eclipse-collections</artifactId> <version>10.4.0</version> </dependency> MutableList<String> list = Lists.mutable.with("A", "B", "C"); list.add("D"); MutableList<Integer> numbers = Lists.mutable.with(1, 2, 3, 4, 5); MutableList<Integer> evenNumbers = numbers.select(n -> n % 2 == 0); MutableList<String> names = Lists.mutable.with("Alice", "Bob", "Charlie"); MutableList<Integer> nameLengths = names.collect(String::length); MutableList<Integer> numbers = Lists.mutable.with(1, 2, 3, 4, 5); int sum = numbers.injectInto(0, (result, number) -> result + number);