Java compile problem

Your code compiles and runs on my computer. Check if it really is identical to what you posted, did you maybe delete one character by accident? Or maybe there is some issue with TextMate? I don't have a Mac so I can't test that.

So I searched some more. It seems this code can run into issues because of:

number1 = input.nextInt();

This means your program waits for input and expects the input to be an int. If the input is empty or isn't an int, Bad Things happen, because this is a very simple program that doesn't deal with these cases. The reason why you get an error with empty input and I don't is probably because you're on a Mac and I'm on Windows, they have slightly different ways to deal with input.

There are ways to deal with it. A simple option is:

import java.util.Scanner;

public class Number {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        int number1 = 0;

        System.out.print("Enter first integer: ");
        if (input.hasNextInt()) {
            number1 = input.nextInt();
        }

        System.out.printf("You entered number %s \n", number1);
    }
}

This will just print 0 if you try typing something that isn't an int. Once you learn about exceptions, you'll learn more ways to improve on this code. But this code you posted is just meant as a simple input / output example, so there's no need to overthink it.