Switch guideJava editor

Keep useful Java examples ready for next time.

Draft a helper, inspect pasted source, or keep a code review note. Java mode saves source locally in your browser and keeps it alongside your other notes.

Open full editor

Your local draft

The notebook’s editing tools, right here. Save to notebook when you want a named copy.

Open editor

Enable JavaScript to edit here, or open the full editor above. The example and guide are always available.

This draft is shared with the full editor for this task and stays separate from named notes. Export a copy or save to notebook to include it in a notebook backup. This editor page and its tools reopen offline after the editor reports readiness. Informational and privacy guides need a connection.

Get started

  1. Create a note and choose Java, or import a .java file.
  2. Edit the source, search for a symbol, or insert a built-in snippet.
  3. Compare a revision in the split panes when needed.
  4. Download the source and check it in your JVM environment.

Open editor takes you to the draft on this page. Paste or open a source file, or choose Try this example. Save to notebook keeps a named copy with your notes. Your workspace style stays unchanged.

Ready.java Java
public class Ready {
    public static void main(String[] args) {
        System.out.println("Ready for review");
    }
}
An editable Java example. Run it in your own JVM environment.Try this example

Edit, compare, and keep reusable source

Import .java source or choose Java in the searchable language chooser. Use find and replace, line numbers, comment toggling, and comparison panes to review changes. Save a useful selection as a snippet or start with a built-in example.

Source highlighting uses a lightweight language mode. Large documents use background highlighting; this is syntax coloring rather than a compiler or full language service.

Run and check code in your JVM environment

The notebook does not execute Java, resolve dependencies, or compile a project. Formatting and minification are unavailable for this mode, so source text stays under your control.

Download the .java source to run it in your own JVM environment. Local notes do not synchronize between devices; export a backup to keep a separate copy.

A few questions

Does this run Java code?

No. It edits and highlights source. Use your own JVM environment to run, compile, and validate it.

Can I edit offline?

Yes, after initial online setup shows Ready to use offline. Notes remain in this browser on this device.