Java wait for user input

public class ScannerTest {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        try {
            while (true) {
                System.out.println("Please input a line");
                long then = System.currentTimeMillis();
                String line = scanner.nextLine();
                long now = System.currentTimeMillis();
                System.out.printf("Waited %.3fs for user input%n", (now - then) / 1000d);
                System.out.printf("User input was: %s%n", line);
            }
        } catch(IllegalStateException | NoSuchElementException e) {
            // System.in has been closed
            System.out.println("System.in was closed; exiting");
        }
    }
}

Source: stackoverflow.com

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