A memorandum for when you want to read a JAR file directly when you want to program lightly in Java and it is troublesome to set up a build tool.
[Update] of VS Code Java Extensions Pack in April 2020 (https://github.com/microsoft/vscode-java-pack/blob/master/release-notes/v0.9.0.md#work-with-jar- files-directly) can now be read without using Maven / Gradle.
Java Extensions Pack
Java Extension Pack is an extension for creating, debugging, and testing Java programs with VS Code. Install here.
Load JAR file
In the left tab, search for “Referenced Libraries” under “JAVA DEPENDENCIES”. Click the + button next to “Referenced Libraries” to add the JAR file.
If JAVA DEPENDENCIES and Referenced Libraries are not displayed
I don’t know why, but it may not be displayed. Restarting VS Code itself usually fixes the problem.
Default library settings
Default can be set by changing
settings.json of VS Code.
"java.project.referencedLibraries": [ "library/**/*.jar" ]