Java扫描仪连续用户输入？

import java.util.Scanner;public class ABC {public static void main(String []args) {        int num;        Scanner scanner = new Scanner(System.in);        System.out.println("Feed me with numbers!");        while((num = scanner.nextInt()) > 0) { System.out.println("Keep Going!");        }        { System.out.println("Number is negative! System Shutdown!"); System.exit(1);        }    }}