Guess a number program with Java

You weren’t getting another input, or keeping count. Try this

public static void main(String args[]) {
    Scanner keyboard = new Scanner(System.in);
    int count = 0;
    int a = 1 + (int) (Math.random() * 99);
    int guess = 0;

    System.out.println("I am thinking of a number from 1 to 100"
        + " ... guess what it is ?");

    while (guess != a) {
        guess = keyboard.nextInt();
        count++;
        if (guess > a) {
            System.out.println("lower!");
        } else if (guess < a) {
            System.out.println("higher!");
        }
    }
    System.out.println("Congratulations. You guessed the number with "
        + count + " tries!");
}

Output

I am thinking of a number from 1 to 100 ... guess what it is ? 
50
higher!
75
lower!
62
Congratulations.   You guessed the number with 3 tries!