Exploring the technology of Kotlin Stdlib Common framework in the Java class library

Exploring the technology of Kotlin Stdlib Common framework in the Java class library Summary: Kotlin is a static type programming language running on the JVM platform, which has good interoperability with the Java language.In order to better support cross -platform development, KOTLIN introduced a framework called Kotlin Stdlib Common.This article will explore how the Kotlin Stdlib Common framework is used in the Java library and provides some Java code examples. introduction: Kotlin Stdlib Common framework is a core component for Kotlin for cross -platform development.It provides a set of universal APIs and tools that can be used to develop applications that are not related to the platform.This allows developers to use the Kotlin language and characteristics in the Java library, bringing more convenience and flexibility to the Java project. Kotlin Stdlib Common framework use: 1. Introduction dependencies: To use the Kotlin Stdlib Common framework in the Java library, we need to introduce related dependencies first. In the Maven project, you can add the following dependencies to the pom.xml file: <dependency> <groupId>org.jetbrains.kotlin</groupId> <artifactId>kotlin-stdlib-common</artifactId> <version>1.5.30</version> </dependency> In the Gradle project, you can add the following dependencies to the built.gradle file: groovy implementation 'org.jetbrains.kotlin:kotlin-stdlib-common:1.5.30' 2. Use Kotlin language characteristics: By introducing the Kotlin Stdlib Common framework, many features of Kotlin language can be used in the Java class library, such as data classes, extension functions, LAMBDA expressions, and NULL security operators.Here are some examples: -Data class: Kotlin's data class can help us quickly define a class for storing data.In the Java class library, we can use the data class to create and operate data objects more conveniently. The example is as follows: // Kotlin data class data class Person(val name: String, val age: Int) // Java usage Person person = new Person("Alice", 25); System.out.println(person.getName()); // Output: Alice System.out.println(person.getAge()); // Output: 25 -Extension function: Kotlin's extension function allows us to add new functions to existing classes without having to modify the definition of the original class.In the Java library, we can use the extension function to add new features to the Java class. For example, as follows: // Kotlin extension function fun String.double(): String { return this + this } // Java usage String str = "Hello"; System.out.println(str.double()); // Output: HelloHello -Ambda expression (Lambda Expression): Kotlin's Lambda expression allows us to define anonymous functions in a simple way.In the Java class library, we can use Lambda expressions to handle functional interfaces more intuitively. For example, as follows: // Kotlin lambda expression val numbers = listOf(1, 2, 3, 4, 5) numbers.forEach { number -> System.out.println(number) } // Java usage List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5); numbers.forEach(number -> System.out.println(number)); -NULL Security Operation (Null Safety): Kotlin's NULL security operator can help us avoid air pointer abnormalities.In the Java class library, we can use the NULL security operator to handle the object that may be empty. For example, as follows: // Kotlin null safety val str: String? = null System.out.println(str?.length) // Output: null // Java usage String str = null; System.out.println(Optional.ofNullable(str).map(String::length).orElse(null)); // Output: null in conclusion: The Kotlin Stdlib Common framework provides many useful functions and characteristics for the Java class library, so that developers can easily use the Kotlin language in the Java project.By introducing the dependencies of Kotlin Stdlib Common and using the characteristics of the Kotlin language, developers can improve the readability, maintenance and scalability of the Java project.