What trends in Java
Java’s list moves more slowly than most and is dominated by long-lived projects: application frameworks, big-data and messaging systems, databases, Android applications written in Java, and study material such as interview guides and algorithm collections, which are popular in this ecosystem.
Why the install box is usually empty
Java libraries are consumed as Maven or Gradle dependencies: a few lines of build configuration with a group, an artifact and a version, not a command to paste in a terminal. This site shows a command only when the README has a real one, so on this page the repository facts — license, last push, open issues — are the more useful signals.
For all languages together, see today’s list, this week or this month.