Introduction to the technical principle of the VAVR framework in the Java library

The VAVR framework is an open source tool set to provide functional programming characteristics for the Java class library.It aims to simplify the writing of Java code and provide a series of efficient and reliable functional programming tools and data types. The main technical principles of the VAVR framework include the following aspects: 1. Immutability: The data types in VAVR are all non -changing, that is, once it is created, it cannot be changed.This design helps to reduce the complicated problems and data competition, and improve the maintenance and security of code. 2. Value Types: VAVR provides a series of values, such as Option, Either, TRY, etc.These types can help us better deal with possible vacancy, abnormalities, etc., and avoid runtime errors such as nullpointerexception. 3. Function Composition: The Vavr framework uses the concept of functional programming widely, providing rich function combination operations, such as Map, Flatmap, Filter, etc.These operations can link multiple functions together to form a function chain, which simplifies the complex data processing process. 4. Lazy Evaluation: Some data types (such as Lazy, Future) in VAVR support the delayed value of value.This means that the calculation of expressions is delayed to the actual results, thereby improving performance and resource utilization. 5. Exception Handling: Vavr provides an abnormal processing mechanism and introduces the Either type to deal with abnormalities.This mechanism can help us better manage and handle abnormalities, and avoid excessive and complicated Try-Catch blocks in traditional Java code. Here are some example code used by some VAVR frameworks: 1. Use Option to process the value that may be empty: Option<String> name = Option.of("John"); Option<String> lastName = Option.of("Doe"); Option<String> fullName = name.flatMap(n -> lastName.map(l -> n + " " + l)); FullName.Foreach (System.out :: Println); // Output: John Doe 2. Use TRY processing that may appear abnormal code block: Try<Integer> result = Try.of(() -> Integer.parseInt("123")); result.onsuccess (system.out :: propln); // Output: 123 Result.onFailure (System.err :: Println); // No output, no abnormality occur Try<Integer> errorResult = Try.of(() -> Integer.parseInt("abc")); Errorresult.onsuccess (System.out :: Println); // will not output, there is abnormal errorResult.onFailure(System.err::println); // 输出：java.lang.NumberFormatException: For input string: "abc" These examples show the simplicity and reliability of the VAVR framework when processing may be empty values, abnormalities, etc.By using the VAVR framework, we can better organize and manage code to improve the readability and maintenance of code.