HiLo.java

HiLo.java

import java.util.*;

public class HiLo {

    int random;
    int guess;

    public void generateNumber() {
        random = (int)(Math.random()*100)+1;
    }

    public void guess() {
        final Scanner sc=new Scanner(System.in);
    
        do {
            System.out.println("Enter your guess:");
            guess = sc.nextInt();
            if(guess < random) {
                System.out.println("Low");
            } else if (guess > random){
                System.out.println("High");
            }
        } while(guess != random);

        System.out.println("Hit");  
    }

    void startGuessing() {
        guess();
    }

}

HiLoStream.java

import java.util.*;
import java.util.function.IntSupplier;
import java.util.stream.IntStream;

public class HiLo {

    int random;

    void generateNumber() {
        random = (int)(Math.random()*100)+1;
    }

    void startGuessing() {
        try(final Scanner in = new Scanner(System.in)) {
            startGuessing(in);
        }
        System.out.println("Hit.");
    }
    
    private void startGuessing(Scanner in) {
        IntStream.generate(takeGuessFrom(in))
            .takeWhile(i -> i != random)
            .mapToObj(i -> (i > random) ? "High" : "Low")
            .forEach(System.out::println);
    }

    private IntSupplier takeGuessFrom(Scanner in) {
        return () -> {
            System.out.println("Enter your guess:");
            return in.nextInt();
        };
    };

}