How to interrupt Java util. Scanner nextline call

I'm using a multithreaded environment. A thread calls scanner repeatedly Nextline() to continuously listen for user input

Closing the stream doesn't seem to be an option because I'm from system In, which returns a non closable InputStream

Is there any way to interrupt the scanner so that it will return?

thank you

Solution

This article describes a method to avoid blocking when reading It gives code snippets that you can modify according to what I pointed out in my comments

import java.io.*;
import java.util.concurrent.Callable;

public class ConsoleInputReadTask implements Callable<String> {
  public String call() throws IOException {
    BufferedReader br = new BufferedReader(
        new InputStreamReader(system.in));
    System.out.println("ConsoleInputReadTask run() called.");
    String input;
    do {
      System.out.println("Please type something: ");
      try {
        // wait until we have data to complete a readLine()
        while (!br.ready()  /*  ADD SHUTDOWN CHECK HERE */) {
          Thread.sleep(200);
        }
        input = br.readLine();
      } catch (InterruptedException e) {
        System.out.println("ConsoleInputReadTask() cancelled");
        return null;
      }
    } while ("".equals(input));
    System.out.println("Thank You for providing input!");
    return input;
  }
}

You can use this code directly or write a new closable InputStream class combined with the logic described in this article