Guess.java

import java.util.Random;
import java.util.Scanner;

public class Guess {
	public static void main(String[] args) {
		Random randNumGen = new Random();
		Scanner input = new Scanner(System.in);
		int numberToGuess = randNumGen.nextInt(100) + 1;
		mainValid(input, numberToGuess);
		input.close();
	}

	public static int getValidInput(Scanner input, String prompt) {
		int value = 0;
		while(true) {
			System.out.print(prompt);
			if (input.hasNextInt()) {
				value = input.nextInt();
				if (value >= 1 && value <= 100) {
					break;
				} else {
					System.out.println("Invalid input. Please enter a number with 1-100.");
				}
			} else {
				System.out.println("Invalid input. Please enter a number from 1-100.");
				input.next();
			}
		}
		return value;
	}

	public static void mainValid(Scanner input, int randNum) {
		int guess;
		int numberOfTries = 0;
		boolean areYaWinninSon = false;
		while (areYaWinninSon == false) {
			guess = getValidInput(input, "Guess a number between 1-100:\t");
			numberOfTries++;

			if (guess == randNum) {
				areYaWinninSon = true;
			} else if (guess < randNum) {
				System.out.println("Your guess is too low.");
			} else {
				System.out.println("Your guess is too high.");
			}
		}
		System.out.println("Congratulations! You've guessed the number in " + numberOfTries + " tries!");
	}
}