A Java REPL (Read-Eval-Print Loop) is an interactive programming environment that allows you to enter Java code, execute it immediately, and see the results in real-time. It’s a useful tool for quickly testing and experimenting with Java code snippets without the need to create full Java applications or compile code separately.

Here are a few options for using a Java REPL:

1. JShell (Java Shell): Starting from Java 9, Java includes a built-in REPL called JShell. You can run JShell by opening a terminal or command prompt and typing jshell. It provides a simple and interactive way to execute Java code, define classes, and explore the Java API.

2. Online Java REPLs: Several online platforms offer web-based Java REPLs, which allow you to write and execute Java code directly in your web browser. Examples include:

   • repl.it
   • OnlineGDB
   • JDoodle

3. IDEs with REPL Support: Some integrated development environments (IDEs) provide REPL functionality, allowing you to run Java code interactively within the IDE. For example, IntelliJ IDEA offers a “Scratch Files” feature that acts as a Java REPL.

4. Third-party REPLs: There are third-party Java REPL tools and libraries that you can use. One such tool is “jrepl,” which is a command-line REPL for Java. You can find it on GitHub and use it to run Java code interactively.

Using a Java REPL is particularly useful for quickly testing code snippets, trying out language features, or debugging small pieces of Java code