Use Scanner to read user input

  
import java.util.Scanner;

class Console {

  static Scanner sc = new Scanner(System.in);

  public static boolean askYorN(String prompt) {
    while (true) {
      String answer;
      System.out.print("\n" + prompt + " (Y or N) ");
      answer = sc.next();
      if (answer.equalsIgnoreCase("Y"))
        return true;
      else if (answer.equalsIgnoreCase("N"))
        return false;
    }
  }
}

public class MainClass {
  public static void main(String[] args) {
    while (Console.askYorN("Keep going?")) {
      System.out.println("!");

    }
  }
}

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Use Scanner to read user input : Scanner « Development Class « Java

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