The application and usage of Apache Groovy in the Java library

Apache Groovy is a dynamic programming language designed for the Java platform, which can integrate and interact with the Java class library.This article will introduce Apache Groovy's application and usage in the Java class library, and provide some Java code examples. 1. The advantage of Apache Groovy 1. Script language characteristics: Apache Groovy has dynamic types, closures, high -level functions and other script language characteristics, so that developers can write code in a more concise and flexible way. 2. Seamless integration with Java: Apache Groovy can directly use the Java code and class library without any additional configuration.This means that you can use the Groovy code directly in the project without having to modify the existing Java code. 2. How to use common Apache Groovy 1. Java class library: Groovy can directly call the Java code and class library without any special processing.The following is an example. How to use Groovy to call Java's string class libraries to operate the string: groovy import java.util.regex.Pattern def matcher = Pattern.compile("Groovy").matcher("Apache Groovy") println matcher.find() 2. Expanded Java class: Groovy allows to add new methods or attributes to the existing Java class to provide more convenient ways to use.The following is an example. How to add a method to Java's string class to `TotitiveCase ()` method: groovy String.metaClass.toTitleCase = { delegate.split(' ').collect { it.capitalize() }.join(' ') } def str = "hello world" println str.toTitleCase() 3. Use the Groovy class library: Groovy has many own class libraries to simplify and enhance the use of the Java class library.The following is an example. How to show how to use Groovy's `jsonbuilder` and` jsonslurper` class libraries to operate JSON data: groovy import groovy.json.JsonBuilder import groovy.json.JsonSlurper def json = new JsonBuilder() json { name "John" age 30 city "New York" } println json.toString() def parsedJson = new JsonSlurper().parseText(json.toString()) println parsedJson.name println parsedJson.age println parsedJson.city The above examples are only a small part of the demonstration of Groovy in the Java class library. Groovy can also be integrated in deeper with other Java class libraries, such as database connections, network requests, etc.Whether it is calling the Java library, extended Java class, or using the Groovy class library, Groovy provides a simple way to interact with Java code. Summarize: Apache Groovy is a powerful and flexible dynamic programming language. It can be closely concentrated with the Java class library and provides rich grammar and characteristics to improve development efficiency.By using Groovy, developers can use the Java class library more concisely, extend the existing Java class, and can also use Groovy's own library to simplify the code.I hope this article will help everyone understand the application and usage of Apache Groovy in the Java class library.