This can be useful if you want to view or edit the source code of a Java program that you don’t have the source code for. Explore executables by dissecting its sections, strings, symbols, raw hex and machine level instructions. Use the autocomplete functionality of Visual Studio Code's settings to view the possible options and their descriptions. An online java decompiler is a tool that decompiles Java class files and converts them back into Java source code. A lightweight, online service for when you don’t have the time, resources, or requirements to use a heavier-weight alternative. The format depends on the chosen decompiler. (replace with the ID of the decompiler you wish to configure): additional configuration to provide to the decompiler. Currently, fernflower, cfr and procyon are supported. (settings.json only): the ID of a decompiler to use.You can use the following settings to customize the decompiler:

This extension does not work with older versions. Language Support for Java™ by Red Hat, version 0.12.0 or greater. To see the decompiler in action, right-click on a Java symbol for which you don't have the source code, and choose Go to Definition (or simply command/ctrl+click on the symbol). It requires Language Support for Java™ by Red Hat, version 0.12.0 or greater. You can right-click Download files to your local file-system right from the sub-workspace. The decompilation result is added to a temporary sub-workspace. This extension allows you to decompile Java class files. Just right-click Decompile on a supported executable and wait for the magic to happen. Decompiler for Java™ in Visual Studio Code

Java decompiler online