This article describes an approach to avoiding blocking when reading. It gives the code snippet, which you could amend as I indicate in a comment.
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 could either use this code directly, or write a new closable InputStream class, wrapping up the logic described in this article.