Letting the user decide when to quit

  

import java.util.Scanner;

public class MainClass {
  static Scanner sc = new Scanner(System.in);

  public static void main(String[] args) {
    int number = 2;
    String input;

    while (true) {
      System.out.println(number + " ");
      System.out.print("Do you want to keep counting?" + " (Y or N)");
      input = sc.next();
      if (input.equalsIgnoreCase("N"))
        break;
      number += 2;
    }
  }
}

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Letting the user decide when to quit : Scanner « Development Class « Java

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