Help with convert a double type number

[trill]

Hi, Is there a way in Java that I can convert a double type number such as 3.1111111111222 to only two decimal places? So it would be as 3.11 only?

Another question is how to do Stop a method from running in Java Code?
For example.. I'm doing a loop.. and a user input a 'char' type.
If it's match, it stop execute, other while it keeps going.
I know have to use input, and if and else statement.
Which I already did.. But I need a method to stop from running.
Thanks.

[hardwired]

Code:

import java.text.NumberFormat;
import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        NumberFormat nf = NumberFormat.getInstance();
        nf.setMaximumFractionDigits(2);
        //nf.setMinimumFractionDigits(2);
        System.out.println(nf.format(3.1111111111222));
        Scanner scanner = new Scanner(System.in);
        String response;
        do {
            System.out.println("Continue? \"y\"");
            response = scanner.nextLine();
        } while(response.equals("y"));
    }