How to "intercept" Ctrl+C in a java CLI application?

How to "intercept" Ctrl+C in a java CLI application?

In a Java CLI (Command Line Interface) application, you can intercept the Ctrl+C signal (SIGINT) to perform specific actions or cleanup tasks before the application exits. To achieve this, you can use Java's Runtime class and a ShutdownHook.

Here's a step-by-step guide on how to intercept Ctrl+C in a Java CLI application:

  1. Create Your Java CLI Application:

    Start by creating your CLI application if you haven't already. This can be a simple Java class with a main method.

  2. Add a ShutdownHook:

    In your main method, you can add a shutdown hook using the Runtime class. A shutdown hook is a piece of code that will be executed when the application receives the Ctrl+C signal.

    public class MyCliApp { public static void main(String[] args) { // Register a shutdown hook Runtime.getRuntime().addShutdownHook(new Thread(() -> { // Perform cleanup tasks or any actions you want System.out.println("Ctrl+C was pressed. Performing cleanup..."); })); // Your CLI application logic here System.out.println("Running your CLI application..."); // Simulate some work (replace this with your application's logic) try { Thread.sleep(5000); // Sleep for 5 seconds } catch (InterruptedException e) { // Handle interruption if necessary } System.out.println("Done!"); } }

    In the code above, we register a shutdown hook that will be executed when Ctrl+C is pressed. You can perform any necessary cleanup tasks or actions inside the lambda expression.

  3. Run Your CLI Application:

    Compile and run your CLI application as you normally would. When you press Ctrl+C while the application is running, the shutdown hook will be triggered, and the specified cleanup code will be executed.

  4. Testing Ctrl+C Behavior:

    Run your application and press Ctrl+C during its execution. You should see the "Ctrl+C was pressed. Performing cleanup..." message printed to the console, indicating that the shutdown hook was executed.

By using a shutdown hook, you can gracefully handle Ctrl+C signals in your Java CLI application and perform any necessary actions, such as saving data or releasing resources, before the application exits.

More Tags

hadoop-partitioning elixir maya build sizewithfont gwt python-dateutil datetime64 angular1.6 android-bitmap

More Java Questions

More Gardening and crops Calculators

More Bio laboratory Calculators

More Livestock Calculators

More Animal pregnancy Calculators