標籤彙整: java 教學書

Google has rolled out a preview of the Android Studio 4.0 IDE, with support for the Jetpack Compose toolkit for building native Android UIs.

Android Studio 4.0 “Canary” works hand in hand with Jetpack Compose, which leverages Kotlin APIs, reduces coding requirements to build native UIs, and automatically updates a UI when state changes. Now entering a developer preview phase, Jetpack Compose is accessible in Android Studio.

Android Studio 4.0 also brings support for some Java 8 APIs, with no requirement for a minimum API level for an app. Using the desugaring process, the DEX D8 compiler in Android Studio 3.x already provided substantial support for Java 8 features such as lambda expressions. With Android Studio 4.0, the desugaring engine was extended to Java language APIs. Developers now can include standard Java language APIs available only in recent releases of Android, such as java.util.streams, in apps that support older versions of Android.

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The September 2019 update to the Visual Studio Code editor, known as version 1.39, includes a number of new capabilities and improvements for Java developers. In addition, support for Java 13, the latest version of standard Java, has been added via the Language Support for Java extension from Red Hat.

New Java features in Visual Studio Code 1.39 include easier navigation of class implementations and overriding methods, inline refactoring, and new code actions and code snippets. The Language Support for Java extension provides Java linting, IntelliSense, refactoring, and Maven and Gradle support. 

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Node.js 13, the latest version of the popular JavaScript runtime, was released this week, emphasizing worker threads, programming enhancements, and internationalization capabilities.

Node.js 13 replaces Node.js 12 as the “current” release but Node.js 12 remains the long-term support (LTS) release. Thus Node.js 13 is not recommended for production use. Nevertheless, Node.js 13 will be useful for building and testing the latest features. Developers can use Node.js 13 to ensure that their packages and applications will be compatible with future versions.

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The relational database has had an astonishingly good run over the last few decades, but new data from Morgan Stanley suggests it may be coming to an end. Sure, change comes slowly in database land, but that change does seem real. In fact, according to the Morgan Stanley research, among all the interest in a variety of “new stack” software, NoSQL databases have a particular shine.

Buying into the “new stack”

While the Morgan Stanley research team doesn’t seem to offer a concrete definition for “new stack” technologies, it does suggest that such technologies include “new concepts such as agile development and devops… that drive higher developer productivity, more complete automation, and, ultimately, faster software development.” Later Morgan Stanley details key categories in this new stack world:

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JSON, for JavaScript Object Notation, is a popular and lightweight data interchange format that has become ubiquitous on the web. JSON is known for being both easy for developers to use and easy for machines to parse and generate.

Not surprisingly, JSON has attracted the attention of tool builders, which have created a variety of tools for reformatting, validating, and parsing JSON. These range from online utilities you run in your web browser to plug-ins for code editors and IDEs such as Visual Studio Code and Eclipse.

Following is a select list of nine of these tools.

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