UserInput

public class UserInput {
	static Scanner input = new Scanner(System.in);

	public static double getDouble() {
		double value;
    	while(true) { // while
    		try {
    			value = input.nextDouble();
    			break;
    		}
    		catch (Exception e) {
    			System.out.print("Error! Please re-enter double value: ");
    			input.next();
    		}
    	}
		input.nextLine();
        return value;
	}

	public static int getIntegerBetween(int min, int max) {
		int value = 0;
    	do { // do-while
    		System.out.printf("Enter the number between [%d - %d]", min, max);
    		try {
    			value = input.nextInt();
    		}
    		catch (Exception e) {
    			System.out.println("Error! Please re-enter integer value");
    			input.next();
    			continue;
    		}
    	} while(value < min || value > max);
    	return value;
	}
	
	public static boolean getUserExitKey()
    {
    	System.out.println("Press q-key to quit the program or enter-key to exit the program");
		String s = input.nextLine();
        if (s.contentEquals("q")) {
            return true;
        }
        else {
            return false;
        }
    }
}