Java Setup 2025

The basic Github Codespaces image has Java built into it. If you are already using a Codespace, skip to the “Check Java” section.

Java Starter Repository

If you already have a codespace, you can skip this section.

To set up a new codespace, find with Github’s blank template and select “Use this template” to open it in a codespace. You can skip all of the configuration options.

Install Code Runner

Code Runner is a simplified way of running programs.

On the left side, find the Extensions (Control-Shift-X), and search for “Code Runner”. Install it. Open the Settings (gear icon). I recommend selecting the following:

• Ignore Selection
• Run In Terminal
• Save All Files Before Run
• Save File Before Run

Turn off Suggestions

Open the Settings (gear icon) or Ctrl-,. Type inlineSuggest in the search bar. Uncheck the boxes that look like the will annoy you, especially:

• Editor > Inline Suggest: Enabled

Check Java

• Make a new Java file: “New file…” and call it Practice.java.

• Include the following text:

    public class Practice {
        public static void main (String[] args) {
            System.out.println("Yes, this works.");
        }
    }
  

• Save (Control-S) and run with the Code Runner “Play” icon or Control-Alt-N keyboard shortcut.