int not equal to string

I am trying to write if statements that set conditions that if user input is anything but integers, it will print out a message and exit. I tried == and != string and stuff like that to no avail.

Any help is appreciated Avery

    System.out.println("What is the reserve price? ");
    int reserve = scanner.nextInt();


    System.out.println("What is the bid of Person 1? ");
    int p1 = scanner.nextInt();

    System.out.println("What is the bid of Person 2? ");
    int p2 = scanner.nextInt();



    if (p1 < reserve && p2 < reserve){
        System.out.println("No one wins because the reserve price of $"+ reserve+ " was not met.");
        System.exit(0);
    }else if (p1 > p2){
        System.out.println("Person 1 wins for $"+p1+".");
    }else if (p2 > p1){
        System.out.println("Person 2 wins for $"+p2+".");
    }
    if (p1==p2){
        System.out.println("It's a tie at $"+p1+".");
    }