Introduction to the unable variable collection type in the VAVR framework

Introduction to the unable variable collection type in the VAVR framework In Java development, the use of non -changing collection types can improve the maintenance and performance of the code.Uncharacteristic collection refers to a collection that cannot be modified once it is created, so there will be no problem of concurrent modification, which can provide thread security operations. VAVR is a functional programming framework that provides a rich uncharacteristic collection type for Java developers.These collection types realize the concept of persistence data structure. Each time the collection is modified, a new collection instance will be created, and the invariance of the original instance is retained. Here are a few unchanged collection types commonly used in the VAVR framework: 1. List (List): The List of Vavr implements a non -changeable linked list.It supports efficient adding, deleting and finding operations, and also provides rich function -type operation methods, such as mapping, filtering, reduction, etc.The following is a simple example of a list: List<String> list = List.of("apple", "banana", "orange"); List<String> newList = list.remove("banana").map(String::toUpperCase); System.out.println (newList); // Output: list (Apple, Orange) 2. SET (collection): Vavr's set achieves a set of unique unique elements.It provides efficient insertion, delete, and finding operations, and supports the intersection, parallel, and different sets of collection.The following is a simple example of set:: Set<Integer> set = HashSet.of(1, 2, 3); Set<Integer> newSet = set.remove(2).map(i -> i * 2); System.out.println (newSet); // Output: HashSet (2, 6) 3. Map (mapping): VAVR's MAP realizes the unable variable key value pairing structure.It provides efficient key value search, insertion, and deletion operations, while supporting rich functional operation methods, such as mapping, filtering, merging, etc.The following is a simple example of a map: Map<String, Integer> map = HashMap.of("apple", 1, "banana", 2, "orange", 3); Map<String, Integer> newMap = map.remove("banana").mapValues(i -> i * 2); System.out.println (newmap); // Output: HashMap (Apple = 1, Orange = 6) 4. Stream (stream): Vavr's Stream provides an inertial data flow.It allows to handle elements in the set in a function -like manner to support various operations, such as filtering, mapping, combination, etc.The following is a simple example of Stream: Stream<Integer> stream = Stream.of(1, 2, 3); int sum = stream.filter(i -> i > 1).map(i -> i * 2).sum().intValue(); System.out.println (SUM); // Output: 8 By using these uncharacteristic collection types in the VAVR framework, we can better write code that is safe, easy to understand and maintain.The characteristics of the uncharacteristic set ensure the predictability and performance of the code, thereby improving the stability and scalability of the application. In short, the uncharacteristic collection type in the VAVR framework provides more choices for Java developers to help us write more elegant and efficient code.