Analysis of the technical principle of using the VAVR framework in the Java class library

VAVR (formerly known as Javaslang) is a powerful Java functional programming library, which provides a rich functional programming feature for the Java class library.The original intention of its design is to make Java developers easier to use the advantages of functional programming to improve the readability and maintenance of code. The technical principles of VAVR mainly involve the following aspects: 1. Unshilation: VAVR encourages the use of unsatisfactory objects to avoid the side effects of concurrent problems and state changes.It provides a series of uncharacteristic collection classes (such as List, SET, and MAP). The operations of these collection classes are non -side effects and returned a new inseparable collection rather than changing the original collection. Example code: List<Integer> numbers = List.of(1, 2, 3, 4, 5); List<Integer> squareNumbers = numbers.map(x -> x * x); In the above example, we use the Vavr List class to create an unsatisfactory integer list.Then, we use the `Map` method to square each element in the list, and get a new uncontrollable list without affecting the content of the original list. 2. Functional programming support: VAVR supports functional programming styles and provides functional interface and high -level functions.It provides core function interfaces such as `Function`,` Predicate` and `Consumer`, as well as high -order functions such as` Map`, Flatmap` and `Reduce`. Example code: Function<Integer, Integer> squared = x -> x * x; int result = squared.apply(5); // result = 25 In the above example, we use the Vavr's `Function` interface to create a function that sets an integer square meter, and then we use the` Apply` method to pass the parameter 5 to the function and get results 25. 3. Abnormal treatment: Vavr provides a set of abnormal treatment tools that make the abnormal processing in functional programming more concise and flexible.It uses a single abnormal type `CheckedException to indicate the detection abnormality, and the` runTimeException` to indicate the abnormal abnormality.In addition, it also provides some tool methods for abnormal treatment, such as `Try` and` Either`. Example code: Either<String, Integer> result = Try.of(() -> Integer.parseInt("123a")) .toEither() .mapLeft(Throwable::getMessage); if (result.isLeft()) { String errorMessage = result.getLeft(); System.out.println("Error: " + errorMessage); } else { int value = result.get(); System.out.println("Value: " + value); } In the above example, we use the Vavr's abnormal processing tool method to try to convert a string into an integer.If the conversion is successful, we will obtain an integer value and print it from the result; if the conversion fails, we will obtain the error message from the result and print it. In summary, the VAVR framework makes the Java class library more useful, flexible and powerful by providing uncomvitutional, functional programming support and abnormal processing.It provides a more elegant and efficient way for Java developers to deal with complex problems and improve the quality and maintenance of code.