Overview of the technical principles of the "VAVR" framework in the Java class library

Vavr (formerly Javaslang) is a Java functional programming framework. It extends the Java class library and provides many functional programming features and data structures.The design goal of VAVR is to make Java stronger and flexible in the field of functional programming, and maintain compatibility with Java. The technical principles of the VAVR framework can be summarized to the following aspects: 1. Immutability: One of the core principles of VAVR is to support functional programming by providing unable variable data structures.Once the unsatisfactory object is created, it cannot be modified, so as to avoid code errors caused by side effects.VAVR provides a series of unable variable data structures, such as list, set, map, etc. to ensure that the data does not change during use. Here are a sample code that uses Vavr's unsusable list: List<String> names = List.of("Alice", "Bob", "Charlie"); List<String> modifiedNames = names.map(name -> name.toUpperCase()); System.out.println(modifiedNames); 2. Higher-Order Function: VAVR supports high-level functions, which means that functions can be passed to other functions as parameters and return values.This function allows us to write more concise, flexible and reused code.Vavr provides many high -end functions, such as MAP, Filter, Reduce, etc., to convert and process the collection. Here are a sample code that uses VAVR high -order functions: List<Integer> numbers = List.of(1, 2, 3, 4, 5); List<Integer> doubledNumbers = numbers.map(number -> number * 2); System.out.println(doubledNumbers); 3. Exception Handling: VAVR provides a set of abnormal processing mechanisms that can better handle abnormalities in Java.The abnormal processing methods in VAVR are implemented through Either and Try.Either can be used to deal with abnormal conditions, and TRY can be used to process code blocks that may throw abnormal abnormalities. Here are a sample code that uses VAVR abnormal processing: Try<Integer> result = Try.of(() -> Integer.parseInt("123")); result.onFailure(error -> System.out.println("Failed: " + error.getMessage())); result.onSuccess(value -> System.out.println("Value: " + value)); 4. Pattern matching: Vavr introduces the concept of mode matching, allowing us to match and handle different situations.Mode matching can simplify complex conditions to judge logic and improve the readability and maintenance of code. Here are a sample code that uses the VAVR mode to match: String result = Match(1).of( Case($(1), "One"), Case($(2), "Two"), Case($(), "Other") ); System.out.println(result); In summary, the VAVR framework expands the Java class library by introducing technical principles such as unsophisticated, high -end functions, abnormal processing and pattern matching, so that Java can better support functional programming paradigms.By using the VAVR framework, we can write more concise, flexible and maintainable code, and can better process abnormalities in Java and process set data.