/*
 * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
 * Date: 2022-04-25
 * Description: This is the CLI class.
 */

import java.util.InputMismatchException;
import java.util.Scanner;

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

	/**
	 * Read one line from CLI.
	 *
	* @param message Hint printed to screen
	* @return one line input
	*/
	private static String readLine(String message) {
		System.out.print(message);
		return input.nextLine();
	}

	/**
	* Read one positive integer.
	*
	* @param message HINT printed to screen
	* @return one positive integer
	*/
	private static int readPosInt(String message) {
		while (true) {
			System.out.print(message);
			try {
				int result = input.nextInt();
				input.nextLine();
				if (result >= 0) {
					return result;
				} else {
					System.out.println("Positive integers only!");
				}
			} catch (InputMismatchException e) {
				System.out.println("You must type an integer!");
				input.nextLine();
			}
		}
	}

	public static void main(String[] args) {
		String str1 = readLine("Type some text: ");
		System.out.println("Text read is: " + str1);
		int i = readPosInt("Type an integer: ");
		System.out.println("Integer read is: " + i);
		String str2 = readLine("Type some text: ");
		System.out.println("Text read is: " + str2);
	}
}